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419 lines
11 KiB
ObjectPascal
419 lines
11 KiB
ObjectPascal
unit FriedmanUnit;
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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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StdCtrls, Buttons, ExtCtrls,
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MainUnit, Globals, OutPutUnit, DataProcs, FunctionsLib, MatrixLib,
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ContextHelpUnit;
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type
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{ TFriedmanFrm }
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TFriedmanFrm = class(TForm)
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Bevel1: TBevel;
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HelpBtn: TButton;
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Panel1: TPanel;
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ResetBtn: TButton;
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ComputeBtn: TButton;
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CloseBtn: TButton;
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GrpVar: TEdit;
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GrpIn: TBitBtn;
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GrpOut: TBitBtn;
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Label2: TLabel;
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Label3: TLabel;
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TreatVars: TListBox;
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TrtIn: TBitBtn;
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TrtOut: TBitBtn;
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Label1: TLabel;
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VarList: TListBox;
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procedure ComputeBtnClick(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 GrpInClick(Sender: TObject);
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procedure GrpOutClick(Sender: TObject);
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procedure HelpBtnClick(Sender: TObject);
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procedure ResetBtnClick(Sender: TObject);
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procedure TrtInClick(Sender: TObject);
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procedure TrtOutClick(Sender: TObject);
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procedure VarListSelectionChange(Sender: TObject; User: boolean);
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private
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{ private declarations }
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FAutosized: Boolean;
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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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FriedmanFrm: TFriedmanFrm;
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implementation
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uses
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Math, Utils;
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{ TFriedmanFrm }
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procedure TFriedmanFrm.ResetBtnClick(Sender: TObject);
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var
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i: integer;
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begin
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VarList.Items.Clear;
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TreatVars.Items.Clear;
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GrpVar.Text := '';
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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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UpdateBtnStates;
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end;
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procedure TFriedmanFrm.TrtInClick(Sender: TObject);
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var
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i: integer;
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begin
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i := 0;
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while i < VarList.Items.Count do
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begin
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if VarList.Selected[i] then
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begin
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TreatVars.Items.Add(VarList.Items[i]);
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VarList.Items.Delete(i);
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i := 0;
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end
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else
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inc(i);
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end;
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UpdateBtnStates;
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end;
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procedure TFriedmanFrm.TrtOutClick(Sender: TObject);
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var
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i: Integer;
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begin
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i := 0;
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while i < TreatVars.Items.Count do
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begin
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if TreatVars.Selected[i] then
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begin
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VarList.Items.Add(TreatVars.Items[i]);
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TreatVars.Items.Delete(i);
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i := 0;
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end else
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inc(i);
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end;
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UpdateBtnStates;
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end;
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procedure TFriedmanFrm.VarListSelectionChange(Sender: TObject; User: boolean);
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begin
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UpdateBtnStates;
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end;
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procedure TFriedmanFrm.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([HelpBtn.Width, ResetBtn.Width, ComputeBtn.Width, CloseBtn.Width]);
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HelpBtn.Constraints.MinWidth := w;
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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 TFriedmanFrm.FormCreate(Sender: TObject);
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begin
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Assert(OS3MainFrm <> nil);
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end;
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procedure TFriedmanFrm.FormShow(Sender: TObject);
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begin
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ResetBtnClick(self);
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end;
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procedure TFriedmanFrm.ComputeBtnClick(Sender: TObject);
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Var
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i, j, k, L, col, itemp, GrpCol, mingrp, maxgrp : integer;
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tiestart, tieend, NoSelected, NCases, group, nogrps : integer;
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s, t, TotRanks, chisqr, probchi, score : double;
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X, ColRanks : DblDyneVec;
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Ranks, means : DblDyneMat;
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RowLabels, ColLabels : StrDyneVec;
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index : IntDyneVec;
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GrpNo : IntdyneMat;
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cellstring: string;
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title : string;
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ties : boolean;
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ColNoSelected : IntDyneVec;
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lReport: TStrings;
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begin
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if GrpVar.Text = '' then begin
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MessageDlg('Group variable not selected.', mtError, [mbOK], 0);
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exit;
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end;
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if TreatVars.Items.Count = 0 then
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begin
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MessageDlg('No treatment variable selected.', mtError, [mbOK], 0);
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exit;
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end;
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k := TreatVars.Items.Count;
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NoSelected := k + 1;
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SetLength(ColNoSelected,NoVariables);
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SetLength(ColLabels,NoVariables);
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// get group variable and treatment variables
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GrpCol := 0;
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for i := 1 to NoVariables do
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begin
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cellstring := OS3MainFrm.DataGrid.Cells[i,0];
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if cellstring = GrpVar.Text then
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begin
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ColNoSelected[0] := i;
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GrpCol := i;
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end;
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for j := 1 to k do
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begin
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if cellstring = TreatVars.Items.Strings[j-1] then
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begin
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ColNoSelected[j] := i;
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ColLabels[j-1] := cellstring;
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end;
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end;
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end;
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// get minimum and maximum group codes
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NCases := 0;
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mingrp := 10000;
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maxgrp := -10000;
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for i := 1 to NoCases do
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begin
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if not GoodRecord(i,NoSelected,ColNoSelected) then continue;
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NCases := NCases + 1;
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group := round(StrToFloat(Trim(OS3MainFrm.DataGrid.Cells[GrpCol,i])));
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if group > maxgrp then maxgrp := group;
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if group < mingrp then mingrp := group;
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end;
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nogrps := maxgrp - mingrp + 1;
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// Initialize arrays
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SetLength(RowLabels,nogrps);
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SetLength(index,k);
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SetLength(GrpNo,nogrps,k);
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SetLength(Ranks,nogrps,k);
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SetLength(means,nogrps,k);
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SetLength(X,k);
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SetLength(ColRanks,k);
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for j := 0 to k-1 do
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begin
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for i := 0 to nogrps-1 do
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begin
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means[i,j] := 0.0;
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Ranks[i,j] := 0.0;
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GrpNo[i,j] := 0;
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end;
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ColRanks[j] := 0.0;
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X[j] := 0.0;
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index[j] := j+1;
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end;
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// Initialize labels
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for i := 1 to nogrps do
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begin
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cellstring := format('Group %d',[mingrp + i - 1]);
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RowLabels[i-1] := cellstring;
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end;
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// Setup for printing results
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lReport := TStringList.Create;
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try
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lReport.Add('FRIEDMAN TWO-WAY ANOVA ON RANKS');
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lReport.Add('See pages 166-173 in S. Siegel''s Nonparametric Statistics');
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lReport.Add('for the Behavioral Sciences, McGraw-Hill Book Co., New York, 1956');
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lReport.Add('');
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// Obtain mean score for each cell
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for i := 1 to NoCases do
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begin
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if ( not GoodRecord(i,NoSelected,ColNoSelected)) then continue;
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group := round(StrToFloat(Trim(OS3MainFrm.DataGrid.Cells[GrpCol,i])));
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group := group - mingrp + 1;
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for j := 1 to k do // treatment values
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begin
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col := ColNoSelected[j];
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score := StrToFloat(Trim(OS3MainFrm.DataGrid.Cells[col,i]));
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means[group-1,j-1] := means[group-1,j-1] + score;
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GrpNo[group-1,j-1] := GrpNo[group-1,j-1] + 1;
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end;
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end;
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for i := 1 to nogrps do
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for j := 1 to k do
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means[i-1,j-1] := means[i-1,j-1] / GrpNo[i-1,j-1];
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// Print means and group size arrays
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title := 'Treatment means - values to be ranked.';
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MatPrint(means,nogrps,k,title,RowLabels,ColLabels,NCases, lReport);
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title := 'Number in each group''s treatment.';
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IntArrayPrint(GrpNo,nogrps,k,'GROUP',RowLabels,ColLabels,title, lReport);
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// Gather row data in X array and rank within rows
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for i := 0 to nogrps-1 do
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begin
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for j := 0 to k-1 do
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begin
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X[j] := means[i,j];
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index[j] := j+1;
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end;
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//rank scores in this row i
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for j := 1 to k - 1 do
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begin
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for L := j + 1 to k do
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begin
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if (X[j-1] > X[L-1]) then
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begin
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t := X[j-1];
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X[j-1] := X[L-1];
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X[L-1] := t;
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itemp := index[j-1];
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index[j-1] := index[L-1];
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index[L-1] := itemp;
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end;
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end;
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end;
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for j := 1 to k do
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begin
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Ranks[i,index[j-1]-1] := j;
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end;
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//Check for tied ranks and use average if desired here
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tiestart := 0;
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tieend := 0;
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ties := false;
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j := 1;
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while j < k do
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begin
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for L := j + 1 to k do
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begin
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if (means[i,j-1] = means[i,L-1]) then
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begin
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ties := true;
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tiestart := j;
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tieend := L;
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end;
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end;
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if (ties = true) then
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begin
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s := 0.0;
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for L := tiestart to tieend do s := s + Ranks[i,L-1];
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for L := tiestart to tieend do
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Ranks[i,L-1] := s / (tieend - tiestart + 1);
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j := tieend;
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ties := false;
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end;
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j := j + 1;
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end; // next j
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end; // next group i
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//Get sum of ranks in columns
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for i := 1 to nogrps do
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for j := 1 to k do
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ColRanks[j-1] := ColRanks[j-1] + Ranks[i-1,j-1];
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//Calculate Statistics
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TotRanks := 0;
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for j := 1 to k do TotRanks := TotRanks + (ColRanks[j-1] * ColRanks[j-1]);
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chisqr := TotRanks * 12.0 / (nogrps * k * (k + 1));
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chisqr := chisqr - (3 * nogrps * (k + 1));
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probchi := 1.0 - chisquaredprob(chisqr, k - 1);
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//Now, show results
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title := 'Score Rankings Within Groups';
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MatPrint(Ranks,nogrps,k,title,RowLabels,ColLabels,NCases, lReport);
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title := 'TOTAL RANKS';
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DynVectorPrint(ColRanks,k,title,ColLabels,NCases, lReport);
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lReport.Add('');
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lReport.Add('Chi-square with %d D.F.: %.3f with probability %.4f', [k-1, chisqr, probchi]);
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if ((k < 5) and (nogrps < 10)) then
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begin
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lReport.Add('Chi-square too approximate-use exact table (TABLE N)');
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lReport.Add('page 280-281 in Siegel');
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end;
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DisplayReport(lReport);
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finally
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lReport.Free;
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ColRanks := nil;
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X := nil;
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means := nil;
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Ranks := nil;
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GrpNo := nil;
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index := nil;
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RowLabels := nil;
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ColLabels := nil;
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ColNoSelected := nil;
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end;
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end;
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procedure TFriedmanFrm.GrpInClick(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 (GrpVar.Text = '') then
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begin
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GrpVar.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 TFriedmanFrm.GrpOutClick(Sender: TObject);
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begin
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if GrpVar.Text <> '' then
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begin
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VarList.Items.Add(GrpVar.Text);
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GrpVar.Text := '';
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end;
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UpdateBtnStates;
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end;
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procedure TFriedmanFrm.HelpBtnClick(Sender: TObject);
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begin
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if ContextHelpForm = nil then
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Application.CreateForm(TContextHelpForm, ContextHelpForm);
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ContextHelpForm.HelpMessage((Sender as TButton).Tag);
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end;
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procedure TFriedmanFrm.UpdateBtnStates;
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var
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lSelected: Boolean;
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begin
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lSelected := AnySelected(VarList);
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GrpIn.Enabled := lSelected and (GrpVar.Text = '');
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TrtIn.Enabled := lSelected;
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GrpOut.Enabled := GrpVar.Text <> '';
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TrtOut.Enabled := AnySelected(TreatVars)
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end;
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initialization
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{$I friedmanunit.lrs}
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end.
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