Distribution plot

 

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'Begin Description
'This script plots the normal-, binomial- and chisquare probability distributions;
'the user chooses the number of degrees of freedom etc.. Charttype and titles
'can be customized from within the dialogbox. The script does a fair amount of 
'checking of the input (range and sign of values), currently no checking is done
'against requesting plots with more categories than SPSS' graph-engine will accept;
'3000. 
'
'Written 27/09/1998 by Rolf Kjшller (rolf.kjoeller@get2net.dk) .
'End Description

Option Explicit
'For localized versions of Windows which use comma (,) 
'instead of period (.) as the decimal separator,
'change the following from False to True
Const DECIMAL_COMMA As Boolean = False
Global strMacrocall As String
Global booInputIsOK As Boolean
Global strMainTitle As String
Global strSubTitle As String
Global intChartType As Integer

Sub Main
	Dim blnOverwriteWarning As Boolean
	
	If SPSSVersion8 Then
		'don't warn unless the data have been modified
		blnOverwriteWarning = objSpssApp.Documents.GetDataDoc(0).Modified
	Else
		'or install code from query.sbs to check
		blnOverwriteWarning = True
	End If
	If blnOverwriteWarning Then
		If vbCancel = MsgBox ("Current data will be overwritten!  OK to proceed?", _
				vbExclamation + vbOkCancel) Then
			Exit Sub
		End If
	End If
	
	Call MainDialog
 End Sub

Sub MainDialog 
	Dim distributions$(3)
	distributions$(1)="Normal"
	distributions$(2)="Binomial"
	distributions$(3)="Chisquare"
	Dim stepvalues$(6)
	stepvalues$(1)="1"
	stepvalues$(2)="0.5"
	stepvalues$(3)="0.1"
	stepvalues$(4)="0.05"
	stepvalues$(5)="0.01"
	stepvalues$(6)="0.005"
	Begin Dialog UserDialog 420,140,"Plot Probability Distributions",.RunMainDialog
		Text 30,7,220,21,"Probability Distribution:",.maintext
		OKButton 290,20,100,20,.cmdOK
		CancelButton 290,50,100,20,.cmdCancel
		DropListBox 30,20,225,77,distributions(),.distribution
		Text 30,50,140,21,"Mean:",.meantext
		TextBox 210,50,45,20,.mean
		Text 30,75,140,20,"Standard Deviation:",.stdevtext
		TextBox 210,75,45,20,.stdev
		Text 30,100,140,21,"Step Value:",.stepvaluetext
		ListBox 185,100,70,28,stepvalues(),.stepvalue
		Text 30,50,140,21,"n trials:",.ntext
		TextBox 210,50,45,20,.n
		Text 30,75,140,20,"Prob:",.Probtext
		TextBox 210,75,45,20,.Prob
		Text 30,50,140,20,"Degrees of Freedom:",.dfstext
		TextBox 210,50,45,20,.dfs
		PushButton 290,100,100,20,"Options ...",.cmdOptions
	End Dialog
	Dim MainDlg As UserDialog
	Dialog MainDlg
End Sub

Sub OptionsDialog 
	Begin Dialog UserDialog 420,140,"Plot Probability Distributions: Options",.RunOptionsDialog
		Text 30,7,140,20,"Titles:",.title
		PushButton 290,20,100,20,"Continue",.cmdContinue
		TextBox 30,20,230,20,.MainTitle
		TextBox 30,50,230,20,.SubTitle
		OptionGroup.ChartType
			OptionButton 30,100,60,20,"Line",.OptionButton1
			OptionButton 120,100,60,20,"Area",.OptionButton2
			OptionButton 210,100,60,20,"Bar",.OptionButton3
		Text 30,87,90,14,"Graph:",.Text1
	End Dialog
	Dim OptionsDlg As UserDialog
	Dialog OptionsDlg
End Sub


Private Function RunMainDialog(DlgItem As String, Action As Integer, SuppValue As Integer) As Boolean
	Select Case Action
	Case 1 'Dialog box initialization
		DlgVisible "meantext",True
		DlgVisible "mean",True
		DlgVisible "stdevtext",True
		DlgVisible "stdev",True
		DlgVisible "stepvaluetext",True
		DlgVisible "stepvalue",True
		DlgVisible "dfstext",False
		DlgVisible "dfs",False
		DlgVisible "ntext",False
		DlgVisible "n",False
		DlgVisible "Probtext",False
		DlgVisible "Prob",False
		DlgValue "stepvalue",2
		DlgFocus "distribution"
		strMainTitle="Normal Distribution"
		strSubTitle="Mean=" + DlgText("mean") + ", Standard Deviation=" + DlgText("stdev")
		intChartType=0
	Case 2 'Value changing or button pressed
		Select Case dlgItem
		Case "distribution" 
			Select Case SuppValue
			Case 0 
				DlgVisible "meantext",True
				DlgVisible "mean",True
				DlgVisible "stdevtext",True
				DlgVisible "stdev",True
				DlgVisible "ntext",False
				DlgVisible "n",False
				DlgVisible "Probtext",False
				DlgVisible "Prob",False
				DlgVisible "dfstext",False
				DlgVisible "dfs",False
				DlgVisible "stepvaluetext",True
				DlgVisible "stepvalue",True
				strMainTitle="Normal Distribution"
				strSubTitle="Mean=" + DlgText("mean") + ", Standard Deviation=" + DlgText("stdev")
				intChartType=0
			Case 1 
				DlgVisible "meantext",False
				DlgVisible "mean",False
				DlgVisible "stdevtext",False
				DlgVisible "stdev",False
				DlgVisible "ntext",True
				DlgVisible "n",True
				DlgVisible "Probtext",True
				DlgVisible "Prob",True
				DlgVisible "dfstext",False
				DlgVisible "dfs",False
				DlgVisible "stepvaluetext",False
				DlgVisible "stepvalue",False
				strMainTitle="Binomial Distribution"
				strSubTitle="n=" + DlgText("n") + ", Prob=" + DlgText("Prob")
				intChartType=2
			Case 2
				DlgVisible "meantext",False
				DlgVisible "mean",False
				DlgVisible "stdevtext",False
				DlgVisible "stdev",False
				DlgVisible "ntext",False
				DlgVisible "n",False
				DlgVisible "Probtext",False
				DlgVisible "Prob",False
				DlgVisible "dfstext",True
				DlgVisible "dfs",True
				DlgVisible "stepvaluetext",True
				DlgVisible "stepvalue",True
				strMainTitle="Chisquare Distribution"
				strSubTitle="df=" + DlgText("dfs")
				intChartType=0
			End Select
		Case "cmdOK"
			strMainTitle="'" + strMainTitle + "'"
			strSubTitle="'" + strSubTitle + "'"
			Select Case DlgText("distribution")
			Case "Normal"
				Call CheckInput (DlgText("mean"), DlgText("stdev"))
				If booInputIsOK Then
					Call BuildMacroCall (DlgText("mean"), DlgText("stdev"))
					Call plot
					RunMainDialog = False
				Else
					RunMainDialog = True
				End If 
			Case "Binomial"
				Call CheckInput (DlgText("n"), DlgText("Prob"))
				If booInputIsOK Then
					Call BuildMacroCall (DlgText("n"), DlgText("Prob"))
					Call plot
					RunMainDialog = False
				Else
					RunMainDialog = True
				End If 
			Case "Chisquare"
				Call CheckInput (DlgText("dfs"))
				If booInputIsOK Then
				Call BuildMacroCall (DlgText("dfs"))
					Call plot
					RunMainDialog = False
				Else
					RunMainDialog = True
				End If 
			End Select
		Case "cmdCancel"
	   		End
		Case "cmdOptions"
			Call OptionsDialog
			RunMainDialog = True
		End Select
	Case 3 'TextBox or ComboBox text changed
		Select Case DlgItem
		Case "mean"
			strMainTitle="Normal Distribution"
			strSubTitle="Mean=" + DlgText("mean") + ", Standard Deviation=" + DlgText("stdev")
			intChartType=0
		Case "stdev"
			strMainTitle="Normal Distribution"
			strSubTitle="Mean=" + DlgText("mean") + ", Standard Deviation=" + DlgText("stdev")
			intChartType=0
		Case "n"
			strMainTitle="Binomial Distribution"
			strSubTitle="n=" + DlgText("n") + ", Prob=" + DlgText("Prob")
			intChartType=2
		Case "Prob"
			strMainTitle="Binomial Distribution"
			strSubTitle="n=" + DlgText("n") + ", Prob=" + DlgText("Prob")
			intChartType=2
		Case "dfs"
			strMainTitle="Chisquare Distribution"
			strSubTitle="df=" + DlgText("dfs")
			intChartType=0
		End Select
	Case 4 'Focus changed
	Case 5 'Idle
	End Select
End Function

Private Function RunOptionsDialog(DlgItem As String, Action As Integer, SuppValue As Integer) As Boolean
	Select Case Action
	Case 1 'Dialog box initialization
		DlgText "MainTitle", strMainTitle
		DlgText "SubTitle", strSubTitle
		DlgValue "ChartType", intChartType
	Case 2 'Value changing or button pressed
		Select Case dlgItem
		Case "cmdContinue"
			strMainTitle=DlgText("MainTitle")
			strSubTitle=DlgText("SubTitle")
			intChartType=DlgValue("ChartType")
	   		Exit Function
	   	End Select
	Case 3 'TextBox or ComboBox text changed
	Case 4 'Focus changed
	Case 5 'Idle
	End Select
End Function

Sub CheckInput (ParamArray InputValueList())
	Dim i As Integer
	Dim j As Integer
	booInputIsOK=False
	For j=0 To UBound(Inputvaluelist)
		'***************************************
		'First check: Is the inputvalue numeric?
		'***************************************
		If DECIMAL_COMMA Then
			'dots are replaced with commas:
			For i=1 To Len(InputValuelist(j))
				If Mid(InputValuelist(j),i,1) = "." Then InputValuelist(j)=Left(InputValuelist(j),i-1)+","+Right(InputValuelist(j),Len(InputValuelist(j))-i)
			Next i
		End If
		booInputIsOK=IsNumeric(InputValuelist(j))
		If Not booInputIsOK Then 
			MsgBox "An input field is either empty or contains non-numeric or multiple values"
			Exit Sub
		End If 
		'****************************************************
		'Second check: Is the inputvalue within proper range?
		'****************************************************
		Select Case DlgText("distribution")
		Case "Normal" 
	 		If j=1 Then
				booInputIsOK = (CDbl(InputValuelist(j))>0)
				If Not booInputIsOK Then 
					MsgBox "Standard Deviation must be greater than 0"
					Exit Sub
				End If
			End If
		Case "Binomial" 
			Select Case j
			Case 0
				booInputIsOK = (CDbl(InputValuelist(j))>0 And CDbl(InputValuelist(j))=Int(CDbl(InputValuelist(j))))
				If Not booInputIsOK Then 
					MsgBox "n must be an integer greater than 0"
					Exit Sub
				End If
			Case 1	
				booInputIsOK = (CDbl(InputValuelist(j))>=0 And CDbl(InputValuelist(j))<=1)
				If Not booInputIsOK Then 
					MsgBox "Prob must be a number between 0 and 1"
					Exit Sub
				End If
			End Select			
		Case "Chisquare"
			booInputIsOK = (CDbl(InputValuelist(j))>0 And CDbl(InputValuelist(j))=Int(CDbl(InputValuelist(j))))
			If Not booInputIsOK Then 
				MsgBox "Degrees of Freedom must be an integer greater than 0"
				Exit Sub
			End If
		End Select	
	Next j
End Sub

Sub BuildMacroCall(ParamArray InputValueList())
	Dim i As Integer
	Dim j As Integer
	For j=0 To UBound(Inputvaluelist)
		'commas are replaced with dots:
		For i=1 To Len(InputValuelist(j))
			If Mid(InputValuelist(j),i,1) = "," Then InputValuelist(j)=Left(InputValuelist(j),i-1)+"."+Right(InputValuelist(j),Len(InputValuelist(j))-i)
		Next i
	Next j 
	Select Case DlgText("distribution")
	Case "Normal"
		strMacrocall="!norm mean=" + InputValuelist(0) + " stdev=" + InputValuelist(1) + " step=" + DlgText("stepvalue") + " ."
	Case "Binomial" 
		strMacrocall="!bin n=" + InputValuelist(0) + " p=" + InputValuelist(1) + " ."
	Case "Chisquare"
		strMacrocall="!chisq df=" + InputValuelist(0) + " step=" + DlgText("stepvalue") + " ."
	End Select
	'MsgBox strMacrocall
End Sub

Sub plot 
Dim strCommand As String
strCommand = strCommand + "SET ERRORS=OFF ." &vbCrLf
strCommand = strCommand + "/******************************************************************************" &vbCrLf
strCommand = strCommand + "/* Normal:" &vbCrLf
strCommand = strCommand + "/******************************************************************************" &vbCrLf
strCommand = strCommand + "DEFINE !norm (mean=!TOKENS(1) /stdev=!TOKENS(1) /step=!DEFAULT(0.05) !TOKENS(1)) ." &vbCrLf
strCommand = strCommand + "NEW FILE ." &vbCrLf
strCommand = strCommand + "INPUT PROGRAM ." &vbCrLf
strCommand = strCommand + "LOOP x=(-4*!stdev+!mean) TO (4*!stdev+!mean) BY !step ." &vbCrLf
strCommand = strCommand + "COMPUTE cpx=CDF.NORM(x,!mean,!stdev) ." &vbCrLf
strCommand = strCommand + "COMPUTE px=CDF.NORM(x,!mean,!stdev)-CDF.NORM(LAG(x),!mean,!stdev) ." &vbCrLf
strCommand = strCommand + "IF x EQ (-4*!stdev+!mean) px=cpx ." &vbCrLf
strCommand = strCommand + "END CASE ." &vbCrLf
strCommand = strCommand + "END LOOP ." &vbCrLf
strCommand = strCommand + "END FILE ." &vbCrLf
strCommand = strCommand + "END INPUT PROGRAM ." &vbCrLf
strCommand = strCommand + "EXECUTE ." &vbCrLf
strCommand = strCommand + "VARIABLE LABELS x 'Z' px 'p(z=Z)' cpx 'p(z<=Z)' ." &vbCrLf
strCommand = strCommand + "!ENDDEFINE ." &vbCrLf
strCommand = strCommand + "/******************************************************************************" &vbCrLf
strCommand = strCommand + "/* Binomial:" &vbCrLf
strCommand = strCommand + "/******************************************************************************" &vbCrLf
strCommand = strCommand + "DEFINE !bin (n=!TOKENS(1) /p=!TOKENS(1)) ." &vbCrLf
strCommand = strCommand + "NEW FILE ." &vbCrLf
strCommand = strCommand + "INPUT PROGRAM ." &vbCrLf
strCommand = strCommand + "LOOP x=0 TO !n BY 1 ." &vbCrLf
strCommand = strCommand + "COMPUTE cpx=CDF.BINOM(x,!n,!p) ." &vbCrLf
strCommand = strCommand + "COMPUTE px=CDF.BINOM(x,!n,!p)-CDF.BINOM(LAG(x),!n,!p) ." &vbCrLf
strCommand = strCommand + "IF x EQ 0 px=cpx ." &vbCrLf
strCommand = strCommand + "END CASE ." &vbCrLf
strCommand = strCommand + "END LOOP ." &vbCrLf
strCommand = strCommand + "END FILE ." &vbCrLf
strCommand = strCommand + "END INPUT PROGRAM ." &vbCrLf
strCommand = strCommand + "EXECUTE ." &vbCrLf
strCommand = strCommand + "FORMAT x (F4) ." &vbCrLf
strCommand = strCommand + "VARIABLE LABELS x 'X' px 'p(x=X)' cpx 'p(x<=X)' ." &vbCrLf
strCommand = strCommand + "!ENDDEFINE ." &vbCrLf
strCommand = strCommand + "/******************************************************************************" &vbCrLf
strCommand = strCommand + "/* Chisquare:" &vbCrLf
strCommand = strCommand + "/******************************************************************************" &vbCrLf
strCommand = strCommand + "DEFINE !chisq (df=!TOKENS(1) /step=!TOKENS(1)) ." &vbCrLf
strCommand = strCommand + "NEW FILE ." &vbCrLf
strCommand = strCommand + "INPUT PROGRAM ." &vbCrLf
strCommand = strCommand + "LOOP x=0 TO 5*!df BY !step ." &vbCrLf
strCommand = strCommand + "COMPUTE cpx=CDF.CHISQ(x,!df) ." &vbCrLf
strCommand = strCommand + "COMPUTE px=CDF.CHISQ(x,!df)-CDF.CHISQ(LAG(x),!df) ." &vbCrLf
strCommand = strCommand + "IF x EQ 0 px=cpx ." &vbCrLf
strCommand = strCommand + "DO IF cpx GT 0.9999 ." &vbCrLf
strCommand = strCommand + "BREAK ." &vbCrLf
strCommand = strCommand + "END IF ." &vbCrLf
strCommand = strCommand + "END CASE ." &vbCrLf
strCommand = strCommand + "END LOOP ." &vbCrLf
strCommand = strCommand + "END FILE ." &vbCrLf
strCommand = strCommand + "END INPUT PROGRAM ." &vbCrLf
strCommand = strCommand + "EXECUTE ." &vbCrLf
strCommand = strCommand + "VARIABLE LABELS x 'Q' cpx 'p(q<=Q)' px 'p(q=Q)' ." &vbCrLf
strCommand = strCommand + "!ENDDEFINE ." &vbCrLf
strCommand = strCommand + "/******************************************************************************" &vbCrLf
strCommand = strCommand + "/* Plot:" &vbCrLf
strCommand = strCommand + "/******************************************************************************" &vbCrLf
strCommand = strCommand + "DEFINE !plot (type=!TOKENS(1)) ." &vbCrLf
strCommand = strCommand + "!IF (!type !EQ 0) !THEN ." &vbCrLf
strCommand = strCommand + "GRAPH" &vbCrLf
strCommand = strCommand + "/TITLE=" + strMainTitle &vbCrLf
strCommand = strCommand + "/SUBTITLE=" + strSubTitle &vbCrLf
strCommand = strCommand + "/LINE(SIMPLE)=VALUE(cpx) BY x ." &vbCrLf
strCommand = strCommand + "GRAPH" &vbCrLf
strCommand = strCommand + "/TITLE=" + strMainTitle &vbCrLf
strCommand = strCommand + "/SUBTITLE=" + strSubTitle &vbCrLf
strCommand = strCommand + "/LINE(SIMPLE)=VALUE(px) BY x ." &vbCrLf
strCommand = strCommand + "!IFEND ." &vbCrLf
strCommand = strCommand + "!IF (!type !EQ 1) !THEN ." &vbCrLf
strCommand = strCommand + "GRAPH" &vbCrLf
strCommand = strCommand + "/TITLE=" + strMainTitle &vbCrLf
strCommand = strCommand + "/SUBTITLE=" + strSubTitle &vbCrLf
strCommand = strCommand + "/LINE(AREA)=VALUE(cpx) BY x ." &vbCrLf
strCommand = strCommand + "GRAPH" &vbCrLf
strCommand = strCommand + "/TITLE=" + strMainTitle &vbCrLf
strCommand = strCommand + "/SUBTITLE=" + strSubTitle &vbCrLf
strCommand = strCommand + "/LINE(AREA)=VALUE(px) BY x ." &vbCrLf
strCommand = strCommand + "!IFEND ." &vbCrLf
strCommand = strCommand + "!IF (!type !EQ 2) !THEN ." &vbCrLf
strCommand = strCommand + "GRAPH" &vbCrLf
strCommand = strCommand + "/TITLE=" + strMainTitle &vbCrLf
strCommand = strCommand + "/SUBTITLE=" + strSubTitle &vbCrLf
strCommand = strCommand + "/BAR(SIMPLE)=VALUE(cpx) BY x ." &vbCrLf
strCommand = strCommand + "GRAPH" &vbCrLf
strCommand = strCommand + "/TITLE=" + strMainTitle &vbCrLf
strCommand = strCommand + "/SUBTITLE=" + strSubTitle &vbCrLf
strCommand = strCommand + "/BAR(SIMPLE)=VALUE(px) BY x ." &vbCrLf
strCommand = strCommand + "!IFEND ." &vbCrLf
strCommand = strCommand + "!ENDDEFINE ." &vbCrLf
strCommand = strCommand + "SET ERRORS=LISTING ." &vbCrLf
strCommand = strCommand + "/******************************************************************************" &vbCrLf
strCommand = strCommand + strMacrocall &vbCrLf
strCommand = strCommand + "!plot type=" + Str(intChartType) &vbCrLf
objSpssApp.ExecuteCommands strCommand , False
End Sub


Function SPSSVersion8 As Boolean
	'turn on error handling
	On Error Resume Next
	'this will cause an error in SPSS 7.5, specifically:
	'	Error 10091
	'	OLE Automation: no such property or method.
	objSpssApp.ScriptParameter(0)
	
	SPSSVersion8 = (Err = 0)
	
	'clear the error, if any
	Err.Clear
	'turn off error handling
	On Error GoTo 0	
End Function
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