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git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@7345 8e941d3f-bd1b-0410-a28a-d453659cc2b4
543 lines
14 KiB
ObjectPascal
543 lines
14 KiB
ObjectPascal
unit ExactUnit;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils, FileUtil, LResources, Forms, Controls, Graphics, Dialogs,
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ExtCtrls, StdCtrls, Buttons, MainUnit, OutPutUnit, FunctionsLib,
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Globals, DataProcs, Math;
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type
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{ TFisherFrm }
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TFisherFrm = class(TForm)
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Bevel1: TBevel;
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Label5: TLabel;
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ResetBtn: TButton;
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ComputeBtn: TButton;
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CloseBtn: TButton;
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RC11Edit: TEdit;
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RC12Edit: TEdit;
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RC21Edit: TEdit;
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RC22Edit: TEdit;
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Label6: TLabel;
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Label7: TLabel;
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Label8: TLabel;
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Label9: TLabel;
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NCasesEdit: TEdit;
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NCasesLabel: TLabel;
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Panel2: TPanel;
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RowIn: TBitBtn;
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RowOut: TBitBtn;
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ColIn: TBitBtn;
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ColOut: TBitBtn;
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DepIn: TBitBtn;
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DepOut: TBitBtn;
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ColEdit: TEdit;
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DepEdit: TEdit;
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RowEdit: TEdit;
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InputGrp: TRadioGroup;
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Label1: TLabel;
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RowLabel: TLabel;
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ColLabel: TLabel;
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DepLabel: TLabel;
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VarList: TListBox;
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Panel1: TPanel;
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procedure ColInClick(Sender: TObject);
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procedure ColOutClick(Sender: TObject);
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procedure ComputeBtnClick(Sender: TObject);
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procedure DepInClick(Sender: TObject);
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procedure DepOutClick(Sender: TObject);
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procedure FormActivate(Sender: TObject);
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procedure FormCreate(Sender: TObject);
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procedure FormShow(Sender: TObject);
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procedure InputGrpClick(Sender: TObject);
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procedure RC11EditKeyPress(Sender: TObject; var Key: char);
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procedure RC12EditKeyPress(Sender: TObject; var Key: char);
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procedure RC21EditKeyPress(Sender: TObject; var Key: char);
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procedure RC22EditKeyPress(Sender: TObject; var Key: char);
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procedure ResetBtnClick(Sender: TObject);
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procedure RowInClick(Sender: TObject);
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procedure RowOutClick(Sender: TObject);
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private
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{ private declarations }
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FAutoSized: Boolean;
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procedure PrintFisherTable(AList: TStrings; A, B, C, D: integer; P, SumP: double);
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procedure UpdateBtnStates;
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public
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{ public declarations }
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end;
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var
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FisherFrm: TFisherFrm;
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implementation
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{ TFisherFrm }
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procedure TFisherFrm.ResetBtnClick(Sender: TObject);
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var
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i: integer;
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begin
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VarList.Clear;
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RowEdit.Text := '';
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ColEdit.Text := '';
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DepEdit.Text := '';
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DepEdit.Visible := false;
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DepIn.Visible := false;
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DepOut.Visible := false;
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NCasesLabel.Visible := false;
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DepLabel.Visible := false;
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NCasesEdit.Text := '';
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NCasesEdit.Visible := false;
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for i := 1 to NoVariables do
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VarList.Items.Add(OS3MainFrm.DataGrid.Cells[i,0]);
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Panel1.Visible := false;
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Panel2.Visible := false;
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RC11Edit.Text := '';
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RC12Edit.Text := '';
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RC21Edit.Text := '';
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RC22Edit.Text := '';
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UpdateBtnStates;
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end;
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procedure TFisherFrm.RowInClick(Sender: TObject);
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var
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index: integer;
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begin
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index := VarList.ItemIndex;
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if (index > -1) and (RowEdit.Text = '') then
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begin
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RowEdit.Text := VarList.Items[index];
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VarList.Items.Delete(index);
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end;
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UpdateBtnStates;
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end;
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procedure TFisherFrm.RowOutClick(Sender: TObject);
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begin
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if RowEdit.Text <> '' then
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begin
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VarList.Items.Add(RowEdit.Text);
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RowEdit.Text := '';
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end;
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UpdateBtnStates;
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end;
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procedure TFisherFrm.FormActivate(Sender: TObject);
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var
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w: Integer;
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begin
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if FAutoSized then
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exit;
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w := MaxValue([ResetBtn.Width, ComputeBtn.Width, CloseBtn.Width]);
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ResetBtn.Constraints.MinWidth := w;
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ComputeBtn.Constraints.MinWidth := w;
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CloseBtn.Constraints.MinWidth := w;
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Constraints.MinWidth := Width;
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Constraints.MinHeight := Height;
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FAutoSized := true;
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end;
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procedure TFisherFrm.FormCreate(Sender: TObject);
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begin
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Assert(OS3MainFrm <> nil);
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if OutputFrm = nil then
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Application.CreateForm(TOutputFrm, OutputFrm);
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end;
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procedure TFisherFrm.FormShow(Sender: TObject);
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begin
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ResetBtnClick(self);
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end;
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procedure TFisherFrm.ColInClick(Sender: TObject);
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var
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index: integer;
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begin
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index := VarList.ItemIndex;
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if (index > -1) and (ColEdit.Text = '') then
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begin
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ColEdit.Text := VarList.Items[index];
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VarList.Items.Delete(index);
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end;
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UpdateBtnStates;
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end;
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procedure TFisherFrm.ColOutClick(Sender: TObject);
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begin
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if ColEdit.Text <> '' then
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begin
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VarList.Items.Add(ColEdit.Text);
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ColEdit.Text := '';
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end;
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UpdateBtnStates;
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end;
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procedure TFisherFrm.ComputeBtnClick(Sender: TObject);
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var
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i, j, row, col, caserow, casecol, A, B, C, D, Largest: integer;
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N, APlusB, APlusC, BPlusD, CPlusD, NoSelected, dep: integer;
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FirstP, p, SumProb, Tocher, Alpha, X: double;
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obs: array[1..2, 1..2] of integer;
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ColNoSelected: IntDyneVec;
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done, ok: boolean;
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response: string;
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lReport: TStrings;
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begin
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Randomize; // initialize random number generator
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row := 0;
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col := 0;
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dep := 0;
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// get column no.s of row and col variables
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if InputGrp.ItemIndex <> 3 then
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begin
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for i := 1 to NoVariables do
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begin
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if RowEdit.Text = OS3MainFrm.DataGrid.Cells[i,0] then row := i;
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if ColEdit.Text = OS3MainFrm.DataGrid.Cells[i,0] then col := i;
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if InputGrp.ItemIndex = 2 then
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begin
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if DepEdit.Text = OS3MainFrm.DataGrid.Cells[i,0] then dep := i;
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end;
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end;
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end;
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SetLength(ColNoSelected,3);
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ColNoSelected[0] := row;
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ColNoSelected[1] := col;
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if InputGrp.ItemIndex = 2 then
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begin
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ColNoSelected[2] := dep;
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NoSelected := 3;
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end else
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NoSelected := 2;
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//initialize observed matrix
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for i := 1 to 2 do
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for j := 1 to 2 do obs[i,j] := 0;
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if InputGrp.ItemIndex = 3 then // get freq. from form
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begin
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if (RC11Edit.Text = '') or not TryStrToInt(RC11Edit.Text, obs[1, 1]) then
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begin
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RC11Edit.SetFocus;
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MessageDlg('No valid input.', mtError, [mbOK], 0);
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exit;
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end;
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if (RC12Edit.Text = '') or not TryStrToInt(RC12Edit.Text, obs[1, 2]) then
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begin
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RC12Edit.SetFocus;
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MessageDlg('No valid input', mtError, [mbOK], 0);
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exit;
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end;
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if (RC21Edit.Text = '') or not TryStrToInt(RC21Edit.Text, obs[2, 1]) then
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begin
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RC21Edit.SetFocus;
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MessageDlg('No valid input.', mtError, [mbOK], 0);
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exit;
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end;
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if (RC22Edit.Text = '') or not TryStrToInt(RC22Edit.Text, obs[2, 2]) then
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begin
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RC22Edit.SetFocus;
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MessageDlg('No valid input', mtError, [mbOK], 0);
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exit;
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end;
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end;
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if InputGrp.ItemIndex = 0 then // count no. in row/col combinations
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begin
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for j := 1 to NoCases do
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begin
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if (not GoodRecord(j,NoSelected,ColNoSelected)) then continue;
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caserow := round(StrToFloat(Trim(OS3MainFrm.DataGrid.Cells[row,j])));
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casecol := round(StrToFloat(Trim(OS3MainFrm.DataGrid.Cells[col,j])));
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if (caserow > 2) or (caserow < 1) then
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begin
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MessageDlg('Row < 1 or > 2 found. Case ignored.', mtInformation, [mbOK], 0);
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continue;
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end;
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if (casecol > 2) or (casecol < 1) then
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begin
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MessageDlg('Column < 1 or > 2 found. Case ignored.', mtInformation, [mbOK], 0);
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continue;
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end;
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obs[caserow, casecol] := obs[caserow, casecol] + 1;
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end;
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end;
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if (InputGrp.ItemIndex = 1) or (InputGrp.ItemIndex = 2) then // Grid has frequencies for row/col
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begin
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for j := 1 to NoCases do
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begin
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if (not GoodRecord(j,NoSelected,ColNoSelected)) then continue;
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caserow := round(StrToFloat(Trim(OS3MainFrm.DataGrid.Cells[row,j])));
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casecol := round(StrToFloat(Trim(OS3MainFrm.DataGrid.Cells[col,j])));
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if (caserow > 2) or (caserow < 1) then
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begin
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MessageDlg('Row < 1 or > 2 found. Case ignored.', mtInformation, [mbOk], 0);
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continue;
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end;
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if (casecol > 2) or (casecol < 1) then
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begin
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MessageDlg('Column < 1 or > 2 found. Case ignored.', mtError, [mbOK], 0);
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continue;
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end;
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obs[caserow, casecol] := round(StrToFloat(Trim(OS3MainFrm.DataGrid.Cells[dep,j])));
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if InputGrp.ItemIndex = 2 then
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obs[caserow,casecol] := obs[caserow,casecol] * StrToInt(NCasesEdit.Text);
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end;
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end;
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//Find smallest value
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A := obs[1, 1];
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B := obs[1, 2];
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C := obs[2, 1];
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D := obs[2, 2];
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APlusB := A + B;
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CPlusD := C + D;
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BPlusD := B + D;
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APlusC := A + C;
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N := A + B + C + D;
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Largest := 1;
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if (B > A) then largest := 2;
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if ((B > A) and (B > C) and (B > D)) then Largest := 2;
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if ((C > A) and (C > B) and (C > D)) then Largest := 3;
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if ((D > A) and (D > B) and (D > C)) then Largest := 4;
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// Ready for output
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lReport := TStringList.Create;
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try
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lReport.Add('FISHER EXACT PROBABILITY TEST');
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lReport.Add('');
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//Get first probability
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FirstP := combos(A, APlusC) * combos(B, BPlusD) / combos(APlusB, N);
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SumProb := FirstP;
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PrintFisherTable(lReport, A, B, C, D, FirstP, SumProb);
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lReport.Add('');
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//Get more extreme probabilities
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done := false;
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while (not done) do
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begin
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case Largest of
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1: begin// top row, first col
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if (A = APlusB) then
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done := true
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else
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begin
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inc(A);
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dec(B);
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dec(C);
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inc(D);
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end;
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end;
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2: begin// top row, second column
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if (B = APlusB) then
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done := true
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else
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begin
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dec(A);
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inc(B);
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inc(C);
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dec(D);
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end;
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end;
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3: begin // second row, first column
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if (C = CPlusD) then
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done := true
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else
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begin
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dec(A);
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inc(B);
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inc(C);
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dec(D);
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end;
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end;
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4: begin // second row, second column
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if (D = CPlusD) then
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done := true
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else
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begin
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inc(A);
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dec(B);
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dec(C);
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inc(D);
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end;
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end;
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end; // end case
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if (not done) then
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begin
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p := combos(A, APlusC) * combos(b, BPlusD) / combos(APlusB, N);
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SumProb := SumProb + p;
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PrintFisherTable(lReport, A, B, C, D, p, SumProb);
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lReport.Add('');
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end;
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end;
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//Tocher's modification
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repeat
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response := FormatFloat('0.00', DEFAULT_ALPHA_LEVEL);
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ok := InputQuery('Alpha', 'Enter your Alpha level (Type I Error rate): ', response);
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if not ok then
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exit;
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if TryStrToFloat(response, Alpha) then
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break
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else
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MessageDlg('Not a valid number.', mtError, [mbOk], 0);
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until false;
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if ((SumProb - FirstP) > Alpha) then //Extreme values > alpha - accept null hypothesis
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lReport.Add('Null hypothesis accepted.')
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else
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begin//Extreme values significant - is total probability significant?
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if (SumProb >= Alpha) then //No, so apply Tocher's rule
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begin
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Tocher := ( Alpha - (SumProb - FirstP)) / FirstP;
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X := random(1000) / 1000.0; //Select a random value between 0 and num - 1
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lReport.Add('Tocher ratio computed: %5.3f', [Tocher]);
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if (X < Tocher) then //Call it significant
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begin
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lReport.Add('A random value of %5.3f selected was less than the Tocher value.', [X]);
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lReport.Add('Conclusion: Reject the null Hypothesis');
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end else
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begin //Call it non-significant
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lReport.Add('A random value of %5.3f selected was greater than the Tocher value.', [X]);
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lReport.Add('Conclusion: Accept the null Hypothesis');
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end;
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end else
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begin //Total probability < alpha - reject null
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lReport.Add('Probability less than alpha - reject null hypothesis.');
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end; // end if-else
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end; // end if-else
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OutputFrm.Clear;
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OutputFrm.AddLines(lReport);
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OutputFrm.ShowModal;
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finally
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lReport.Free;
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end;
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end;
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procedure TFisherFrm.DepInClick(Sender: TObject);
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var
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index: integer;
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begin
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index := VarList.ItemIndex;
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if (index > -1) and (DepEdit.Text = '') then
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begin
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DepEdit.Text := VarList.Items[index];
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VarList.Items.Delete(index);
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end;
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UpdateBtnStates;
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end;
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procedure TFisherFrm.DepOutClick(Sender: TObject);
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begin
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if DepEdit.Text <> '' then
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begin
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VarList.Items.Add(DepEdit.Text);
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DepEdit.Text := '';
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end;
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UpdateBtnStates;
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end;
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procedure TFisherFrm.InputGrpClick(Sender: TObject);
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begin
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if InputGrp.ItemIndex = 3 then
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begin
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Panel2.Visible := true;
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Panel1.Visible := false;
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RC11Edit.SetFocus;
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end else
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begin
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Panel1.Visible := true;
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Panel2.Visible := false;
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ColIn.Enabled := true;
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ColOut.Enabled := false;
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if InputGrp.ItemIndex = 2 then
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begin
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NCasesLabel.Visible := true;
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NCasesEdit.Visible := true;
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end
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else begin
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NCasesLabel.Visible := false;
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NCasesEdit.Visible := false;
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end;
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if InputGrp.ItemIndex = 0 then
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begin
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DepLabel.Visible := false;
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DepEdit.Visible := false;
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DepIn.Visible := false;
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DepOut.Visible := false;
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end
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else begin // InputGrp = 1
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DepLabel.Visible := true;
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DepEdit.Visible := true;
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DepIn.Visible := true;
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DepOut.Visible := true;
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DepIn.Enabled := true;
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DepOut.Enabled := false;
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end;
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end;
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end;
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procedure TFisherFrm.RC11EditKeyPress(Sender: TObject; var Key: char);
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begin
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if Key = #13 then RC12Edit.SetFocus;
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end;
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procedure TFisherFrm.RC12EditKeyPress(Sender: TObject; var Key: char);
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begin
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if Key = #13 then RC21Edit.SetFocus;
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end;
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procedure TFisherFrm.RC21EditKeyPress(Sender: TObject; var Key: char);
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begin
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if Key = #13 then RC22Edit.SetFocus;
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end;
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procedure TFisherFrm.RC22EditKeyPress(Sender: TObject; var Key: char);
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begin
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if Key = #13 then ComputeBtn.SetFocus;
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end;
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procedure TFisherFrm.PrintFisherTable(AList: TStrings;
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A, B, C, D: integer; P, SumP: double);
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begin
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AList.Add('Contingency Table for Fisher Exact Test');
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AList.Add(' Column');
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AList.Add('Row 1 2');
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AList.Add(' 1 %10d %10d', [A, B]);
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AList.Add(' 2 %10d %10d', [C, D]);
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AList.Add('');
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AList.Add('Probability = %6.4f', [P]);
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AList.Add('Cumulative Probability = %6.4f', [SumP]);
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AList.Add('');
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end;
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procedure TFisherFrm.UpdateBtnStates;
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begin
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RowIn.Enabled := VarList.ItemIndex > -1;
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ColIn.Enabled := VarList.ItemIndex > -1;
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DepIn.Enabled := VarList.ItemIndex > -1;
|
|
RowOut.Enabled := RowEdit.Text <> '';
|
|
ColOut.Enabled := ColEdit.Text <> '';
|
|
DepOut.Enabled := DepEdit.Text <> '';
|
|
end;
|
|
|
|
initialization
|
|
{$I exactunit.lrs}
|
|
|
|
end.
|
|
|