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*! Version 3.2 17july2019
*! Jean-Benoit Hardouin
************************************************************************************************************
* Stata program : pcm
* Estimate the parameters of the Partial Credit Model
* Version 1 : December 17, 2007 [Jean-Benoit Hardouin]
* Version 2 : July 15, 2011 [Jean-Benoit Hardouin]
* Version 2.1 : October 18th, 2011 [Jean-Benoit Hardouin] : -fixedvar- option, new presentation
* Version 2.2 : October 23rd, 2013 [Jean-Benoit Hardouin] : correction of -fixedvar- option
* Version 2.3 : April 10th, 2014 [Jean-Benoit Hardouin] : correction of -fixedvar- option
* Version 2.3 : April 10th, 2014 [Jean-Benoit Hardouin] : correction of -fixedvar- option
* Version 3 : July 6th, 2019 [Jean-Benoit Hardouin] : New version using gsem
* Version 3.1 : July 9th, 2019 [Jean-Benoit Hardouin] : Small corrections
* Version 3.2 : July 17th, 2019 [Jean-Benoit Hardouin] : Small corrections
*
*
*
* Jean-benoit Hardouin - University of Nantes - France
* INSERM UMR 1246-SPHERE "Methods in Patient Centered Outcomes and Health Research", Nantes University, University of Tours
* jean-benoit.hardouin@univ-nantes.fr
*
* News about this program : http://www.anaqol.org
*
* Copyright 2007, 2011, 2013, 2014, 2019 Jean-Benoit Hardouin
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
************************************************************************************************************/
program define pcm, rclass
syntax varlist(min=2 numeric) [, CONTinuous(varlist) CATegorical(varlist) ITerate(int 100) TOLerance(real 0.01) model DIFFiculties(string) rsm Graphs noGRAPHItems filesave dirsave(string) docx(string) extension(string)]
qui count
local nbobs=r(N)
/*************************************************************************************************************
GESTION DES VARIABLES CONTINUES ET CATEGORIELLES
*************************************************************************************************************/
local modcont
local nbpar=0
local nbcont=0
local nbcat=0
if "`continuous'"!="" {
tokenize `continuous'
local nbcont : word count `continuous'
local continuous
forvalues i=1/`nbcont' {
local cont`i' ``i''
local continuous `continuous' ``i''
local modcont `modcont' ``i''
local ++nbpar
}
local modcont (`modcont'->T)
}
local modcat
if "`categorical'"!="" {
tokenize `categorical'
local nbcat : word count `categorical'
local categorical
forvalues i=1/`nbcat' {
local cat`i' ``i''
local categorical `categorical' ``i''
local modcat `modcat' i.``i''
qui levelsof ``i''
local levelsof``i'' `r(levels)'
local nbpar=`nbpar'+`r(r)'-1
*di "categorical : ``i'' levels : `levelsof``i'''"
}
local modcat (`modcat'->T)
}
if "`dirsave'"=="" {
local dirsave `c(pwd)'
}
/*************************************************************************************************************
GESTION DES ITEMS ET TESTS
*************************************************************************************************************/
tokenize `varlist'
local nbitems : word count `varlist'
marksample touse ,novarlist
preserve
local modamax=1
local modamin=0
local pbmin
local nbdiff=0
forvalues i=1/`nbitems' {
qui su ``i''
if `r(min)'!=`modamin' {
local modamin=r(min)
local pbmin `pbmin' ``i''
}
if `r(max)'>`modamax' {
local modamax=r(max)
}
local modamax``i''=r(max)
if "`rsm'"=="" {
local nbdiff=`nbdiff'+`modamax``i'''
}
}
if "`rsm'"!="" {
local nbdiff=`nbitems'+`modamax'-1
}
if `modamin'!=0 {
di as error "The minimal answer category of each item must be coded by 0. This is not the case for the following items: `pbmin' (`modamin') "
error 198
}
qui count
local nbind=r(N)
*set trace on
local code
forvalues k=1/`modamax' {
local code`k'
forvalues i=1/`nbitems' {
if `k'<=`modamax``i''' {
local code`k' `code`k'' `k'.``i''
}
}
local code`k' (`code`k''<-T@`k')
local code `code' `code`k''
}
/*************************************************************************************************************
RECUPERATION DES PARAMETRES DE DIFFICULTES ET DEFINITION DES CONTRAINTES
*************************************************************************************************************/
if "`difficulties'"!=""&"`rsm'"!="" {
di as error "You can not defined in the same time the difficulties and the rsm options"
error 198
}
if "`difficulties'"!="" {
local t=1
local constraints
forvalues i=1/`nbitems' {
forvalues k=1/`modamax``i''' {
if `difficulties'[`i',`k']==. {
di as error "The kth difficulty parameter of the item ``i'' is not correctly defined in the difficulties matrix"
error 198
}
else {
local val=0
forvalues l=1/`k' {
local val=`val'-`difficulties'[`i',`l']
}
constraint `t' [`k'.``i'']_cons=`val'
local constraints `constraints' `t'
local ++t
}
}
}
}
/*************************************************************************************************************
DEFINITION DES CONTRAINTES POUR UN RSM
*************************************************************************************************************/
if "`rsm'"!="" {
local t=1
local constraints
forvalues k=2/`modamax' {
forvalues i=2/`nbitems' {
constraint `t' [`=`k'-1'.``i'']_cons-[`k'.``i'']_cons+[1.``i'']_cons=[`=`k'-1'.`1']_cons-[`k'.`1']_cons+[1.`1']_cons
local constraints `constraints' `t'
local ++t
}
}
}
/*************************************************************************************************************
MODELE
*************************************************************************************************************/
discard
*di "`qui' gsem `code' `modcont' `modcat' ,iterate(`iterate') tol(`tolerance') constraint(`constraints')"
local qui qui
if "`model'"!="" {
local qui
}
`qui' gsem `code' `modcont' `modcat' ,iterate(`iterate') tol(`tolerance') constraint(`constraints')
local ll=e(ll)
*set trace on
tempvar latent score group selatent latent2
tempname groups
qui predict mu, mu
*su mu
qui predict `latent',latent se(`selatent')
set seed 123456
qui gen `latent2'=`latent'+invnorm(uniform())*`selatent'
qui genscore `varlist',score(`score')
qui gengroup `latent',newvariable(`group') continuous
qui levelsof `group'
local nbgroups=r(r)
matrix `groups'=J(`nbgroups',`=`nbitems'+3',.)
forvalues g=1/`nbgroups' {
matrix `groups'[`g',`=`nbitems'+3']=0
forvalues i=1/`nbitems' {
*tab ``i'' if `group'==`g'
qui count if ``i''!=.&`group'==`g'
local n=r(N)
if `n'>0 {
qui su ``i'' if `group'==`g'
matrix `groups'[`g',`i']=r(mean)
matrix `groups'[`g',`=`nbitems'+3']=`groups'[`g',`=`nbitems'+3']+`r(mean)'
}
else {
matrix `groups'[`g',`i']=.
matrix `groups'[`g',`=`nbitems'+3']=.
}
}
qui su `latent' if `group'==`g'
matrix `groups'[`g',`=`nbitems'+1']=r(mean)
qui count if `group'==`g'
matrix `groups'[`g',`=`nbitems'+2']=r(N)
}
*matrix list `groups'
qui count if `score'!=.
local nbobsssmd=r(N)
di
di as text "Number of individuals:" %6.0f as result `nbobs'
di as text "Number of complete individuals:" %6.0f as result `nbobsssmd'
di as text "Number of items:" %6.0f as result `nbitems'
di as text "Marginal log-likelihood:" %12.4f as result `ll'
di
return scalar ll=`ll'
*set trace on
/*************************************************************************************************************
RECUPERATION DES ESTIMATIONS DES PARAMETRES DE DIFFICULTE
*************************************************************************************************************/
tempname diff diffmat vardiff diffmat2
*set trace on
qui matrix `diffmat'=J(`nbitems',`modamax',.)
qui matrix `diffmat2'=J(`nbitems',`modamax',.)
qui matrix `diff'=J(`nbdiff',6,.)
local rn
*qui matrix `vardiff'=J(`nbdiff',`nbdiff',.)
*matrix list `diff'
*set trace on
local t=1
forvalues i=1/`nbitems' {
qui matrix `diffmat'[`i',1]=-_b[1.``i'':_cons]
qui matrix `diffmat2'[`i',1]=-_b[1.``i'':_cons]
qui lincom -_b[1.``i'':_cons]
qui matrix `diff'[`t',1]=`r(estimate)'
qui matrix `diff'[`t',2]=`r(se)'
qui matrix `diff'[`t',3]=`r(z)'
qui matrix `diff'[`t',4]=`r(p)'
qui matrix `diff'[`t',5]=`r(lb)'
qui matrix `diff'[`t',6]=`r(ub)'
*qui matrix `vardiff'[`t',`t']=_se[1.``i'':_cons]^2
local rn `rn' 1.``i''
local ++t
local sum _b[1.``i'':_cons]
if "`rsm'"=="" {
forvalues k=2/`modamax``i''' {
local sum "_b[`k'.``i'':_cons]-`sum'"
qui lincom -(`sum')
*set trace on
qui matrix `diffmat'[`i',`k']=`r(estimate)'
qui matrix `diffmat2'[`i',`k']=`diffmat'[`i',`k']+`diffmat2'[`i',`=`k'-1']
qui matrix `diff'[`t',1]=`r(estimate)'
qui matrix `diff'[`t',2]=`r(se)'
qui matrix `diff'[`t',3]=`r(z)'
qui matrix `diff'[`t',4]=`r(p)'
qui matrix `diff'[`t',5]=`r(lb)'
qui matrix `diff'[`t',6]=`r(ub)'
*qui matrix `vardiff'[`t',`t']=`r(se)'^2
*set trace off
local rn `rn' `k'.``i''
local ++t
}
}
}
if "`rsm'"!="" {
forvalues k=2/`modamax' {
qui lincom _b[`=`k'-1'.`1':_cons]-_b[`k'.`1':_cons]+_b[1.`1':_cons]
qui matrix `diff'[`t',1]=`r(estimate)'
qui matrix `diff'[`t',2]=`r(se)'
qui matrix `diff'[`t',3]=`r(z)'
qui matrix `diff'[`t',4]=`r(p)'
qui matrix `diff'[`t',5]=`r(lb)'
qui matrix `diff'[`t',6]=`r(ub)'
forvalues i=1/`nbitems' {
qui matrix `diffmat'[`i',`k']=`diff'[`t',1]+`diffmat'[`i',1]
qui matrix `diffmat2'[`i',`k']=`diffmat'[`i',`k']+`diffmat2'[`i',`=`k'-1']
}
local rn `rn' tau`k'
local ++t
}
}
local cn Estimate S.e. z p "Lower bound" "Upper Bound"
matrix colnames `diff'=`cn'
matrix rownames `diff'=`rn'
*matrix list `diff'
*matrix list `diffmat'
*matrix list `diffmat2'
*matrix list `vardiff'
/*************************************************************************************************************
RECUPERATION DES ESTIMATIONS DES PARAMETRES POUR LES COVARIABLES ET LA VARIANCE
*************************************************************************************************************/
tempname covariates
qui matrix `covariates'=J(`=`nbpar'+1',6,.)
*set trace on
if "`continuous'"!=""|"`categorical'"!="" {
qui lincom _b[/var(e.T)]
}
else {
qui lincom _b[/var(T)]
}
qui matrix `covariates'[1,1]=`r(estimate)'
qui matrix `covariates'[1,2]=`r(se)'
qui matrix `covariates'[1,3]=`r(z)'
qui matrix `covariates'[1,4]=`r(p)'
qui matrix `covariates'[1,5]=`r(lb)'
qui matrix `covariates'[1,6]=`r(ub)'
local t=2
forvalues i=1/ `nbcont' {
qui lincom `cont`i''
qui matrix `covariates'[`t',1]=`r(estimate)'
qui matrix `covariates'[`t',2]=`r(se)'
qui matrix `covariates'[`t',3]=`r(z)'
qui matrix `covariates'[`t',4]=`r(p)'
qui matrix `covariates'[`t',5]=`r(lb)'
qui matrix `covariates'[`t',6]=`r(ub)'
local ++t
}
forvalues i=1/ `nbcat' {
local first=0
foreach j in `levelsof`cat`i''' {
if `first'==0 {
local ++first
}
else {
qui lincom `j'.`cat`i''
qui matrix `covariates'[`t',1]=`r(estimate)'
qui matrix `covariates'[`t',2]=`r(se)'
qui matrix `covariates'[`t',3]=`r(z)'
qui matrix `covariates'[`t',4]=`r(p)'
qui matrix `covariates'[`t',5]=`r(lb)'
qui matrix `covariates'[`t',6]=`r(ub)'
local ++t
}
}
}
* matrix list `covariates'
/*************************************************************************************************************
OUTPUTS
*************************************************************************************************************/
local t=1
local diffname
*set trace on
di "{hline 73}"
di as text _col(60) "<--95% IC -->"
di "Items" _col(60) "Lower" _col(68) "Upper"
di "parameters" _col(13) "category" _col(25) "Estimate" _col(37) "s.e." _col(48) "z" _col(56) "p" _col(59) " Bound" _col(68) "Bound"
di "{hline 73}"
*set trace on
forvalues i=1/`nbitems' {
*local l=1
forvalues j=1/`modamax``i''' {
if "`rsm'"==""|`j'==1 {
if `j'==1 {
di as text abbrev("``i''",19) _c
}
di as text _col(20) %5.2f "`j'" as result _col(28) %5.2f `diff'[`t',1] _col(36) %5.2f `diff'[`t',2] _col(44) %5.2f `diff'[`t',3] _col(52) %5.2f `diff'[`t',4] _col(60) %5.2f `diff'[`t',5] _col(68) %5.2f `diff'[`t',6]
local ++t
*local ++l
local diffname `diffname' `j'.``i''
}
}
}
if "`rsm'"!="" {
forvalues k=2/`modamax' {
di as text "tau`k'" as result _col(28) %5.2f `diff'[`t',1] _col(36) %5.2f `diff'[`t',2] _col(44) %5.2f `diff'[`t',3] _col(52) %5.2f `diff'[`t',4] _col(60) %5.2f `diff'[`t',5] _col(68) %5.2f `diff'[`t',6]
local diffname `diffname' tau`k'
local ++t
}
}
di as text "{hline 73}"
local t=1
local n: word count Variance `continuous'
forvalues i=1/`n' {
local v: word `i' of Variance `continuous'
di as text _col(1) %5.2f "`v'" as result _col(28) %5.2f `covariates'[`t',1] _col(36) %5.2f `covariates'[`t',2] _col(44) %5.2f `covariates'[`t',3] _col(52) %5.2f `covariates'[`t',4] _col(60) %5.2f `covariates'[`t',5] _col(68) %5.2f `covariates'[`t',6]
local ++t
}
local rn Variance `continuous'
local n: word count of `categorical'
local catname
forvalues i=1/`n' {
local v: word `i' of `categorical'
local first=1
local saute=1
foreach j in `levelsof`cat`i''' {
if `saute'==0 {
if `first'==1 {
di as text _col(1) abbrev("`v'",19) _c
}
di as text _col(20) %5.2f "`j'" as result _col(28) %5.2f `covariates'[`t',1] _col(36) %5.2f `covariates'[`t',2] _col(44) %5.2f `covariates'[`t',3] _col(52) %5.2f `covariates'[`t',4] _col(60) %5.2f `covariates'[`t',5] _col(68) %5.2f `covariates'[`t',6]
local ++first
local rn `rn' `j'.`n'
local ++t
local catname `catname' `j'.`v'
}
else {
local saute=0
}
}
local ++t
}
di as text "{hline 73}"
di
qui su `latent'
qui local PSI=1-(`r(sd)')^2/((`covariates'[1,1])^2)
di as text "PSI:" as result %4.2f `PSI'
di
matrix colnames `covariates'=`cn'
matrix rownames `covariates'=`rn'
/*************************************************************************************************************
FIT TESTS
*************************************************************************************************************/
tempname fit
qui matrix `fit'=J(`nbitems',4,.)
matrix colnames `fit'=OUTFIT INFIT "Standardized OUTFIT" "Standardized INFIT"
matrix rownames `fit'=`varlist'
*matrix list `fit'
tempvar Tcum TInf cum
qui gen `Tcum'=0
qui gen `TInf'=0
di as text "{hline 90}"
di as text _col(60) "<--- Standardized --->"
di as text "Items" _col(34) "OUTFIT" _col(50) "INFIT" _col(64) "OUTFIT" _col(80) "INFIT"
di as text "{hline 90}"
di as text "Referenced values*" _col(29) "[" %4.2f `=1-6/sqrt(`nbobs')' ";" %4.2f `=1+6/sqrt(`nbobs')' "]" _col(44) "[" %4.2f `=1-2/sqrt(`nbobs')' ";" %4.2f `=1+2/sqrt(`nbobs')' "]" _col(60) "[-2.6;2.6]" _col(75) "[-2.6;2.6]"
di as text "Referenced values**" _col(29) "[0.75;1.30]" _col(44) "[0.75;1.30]" _col(60) "[-2.6;2.6]" _col(75) "[-2.6;2.6]"
di as text "{hline 90}"
*set trace on
local chi2=0
local chi2_old=0
forvalues g=1/`nbgroups' {
local chi2_g`g'=0
local chi2_old_g`g'=0
}
forvalues i=1/`nbitems' {
if "`rsm'"=="" {
local mm=`modamax``i'''
}
else {
local mm `modamax'
}
tempvar cum_old``i'' c_old0_``i'' Inf_old``i'' y_old``i'' y2_old``i''
tempvar cum``i'' c0_``i'' Inf``i'' C``i'' C2``i'' C3``i'' y``i'' y2``i'' z``i'' z2``i'' i``i''
local d=1
local d_old=1
qui gen `cum``i'''=0
qui gen `cum_old``i'''=0
forvalues k=1/`mm' {
local d `d'+exp(`k'*`latent2'-`diffmat2'[`i',`k'])
local d_old `d_old'+exp(`k'*`latent'-`diffmat2'[`i',`k'])
}
qui gen `c0_``i'''=1/(`d')
qui gen `c_old0_``i'''=1/(`d_old')
forvalues k=1/`mm' {
tempvar c`k'_``i'' c_old`k'_``i''
qui gen `c`k'_``i'''=exp(`k'*`latent2'-`diffmat2'[`i',`k'])/(`d')
qui gen `c_old`k'_``i'''=exp(`k'*`latent'-`diffmat2'[`i',`k'])/(`d')
qui replace `cum``i'''=`cum``i'''+`c`k'_``i'''*`k'
qui replace `cum_old``i'''=`cum_old``i'''+`c_old`k'_``i'''*`k'
}
qui gen `Inf``i'''=0
qui gen `Inf_old``i'''=0
qui gen `C``i'''=0
forvalues k=0/`mm' {
qui replace `Inf``i'''=`Inf``i'''+(`k'-`cum``i''')^2*`c`k'_``i'''
qui replace `Inf_old``i'''=`Inf_old``i'''+(`k'-`cum_old``i''')^2*`c_old`k'_``i'''
qui replace `C``i'''=`C``i'''+(`k'-`cum``i''')^4*`c`k'_``i'''
}
qui count if ``i''!=.
local n``i''=r(N)
qui gen `C2``i'''=`C``i'''/((`Inf``i''')^2)
qui su `C2``i'''
local q2o``i''=(`r(mean)'-1)/((`n``i'''))
qui gen `C3``i'''=`C``i'''-(`Inf``i''')^2
qui su `C3``i'''
local n=r(sum)
qui su `Inf``i'''
local d=r(sum)
local q2i``i''=`n'/((`d')^2)
//di "``i'' qo = `=sqrt(`q2o``i''')' qi = `=sqrt(`q2i``i''')'"
qui replace `Tcum'=`Tcum'+`cum``i'''
qui replace `TInf'=`TInf'+`Inf``i'''
qui gen `y``i'''=``i''-`cum``i'''
qui gen `y_old``i'''=``i''-`cum_old``i'''
qui gen `y2``i'''=(`y``i''')^2
qui gen `y2_old``i'''=(`y_old``i''')^2
qui gen `z``i'''=(`y``i'''/sqrt(`Inf``i'''))
local chi2_``i''=0
local chi2_old_``i''=0
forvalues g=1/`nbgroups' {
qui su `y2``i''' if `group'==`g'
local n=r(sum)
qui su ``i'' if `group'==`g'
local n1=r(sum)
qui su `cum``i''' if `group'==`g'
local n2=r(sum)
qui su `Inf``i''' if `group'==`g'
local d=r(sum)
*di "chi2_`g'_``i''=`chi2'+(`n1'-`n2')^2/(`d')"
local chi2=`chi2'+(`n1'-`n2')^2/(`d')
local chi2_``i''=`chi2_``i'''+(`n1'-`n2')^2/(`d')
local chi2_g`g'=`chi2_g`g''+(`n1'-`n2')^2/(`d')
qui su `y2_old``i''' if `group'==`g'
local n_old=r(sum)
qui su ``i'' if `group'==`g'
local n1_old=r(sum)
qui su `cum_old``i''' if `group'==`g'
local n2_old=r(sum)
qui su `Inf_old``i''' if `group'==`g'
local d_old=r(sum)
local chi2_old=`chi2_old'+(`n1_old'-`n2_old')^2/(`d_old')
local chi2_old_``i''=`chi2_old_``i'''+(`n_old')/(`d_old')
local chi2_old_g`g'=`chi2_old_g`g''+(`n_old')/(`d_old')
}
*di "Item ``i'' Chi2``i''=`chi2_``i''' et chi2=`chi2' Chi2_old=`chi2_old_``i''' et chi2_old=`chi2_old' "
*su `z``i'''
label variable `z``i''' "Standardized residuals associated to ``i''"
label variable `latent' "Latent trait"
*set trace on
if "`graphs'"!=""&"`graphitems'"=="" {
if "`filesave'"!="" {
local fs saving(`dirsave'//residuals_``i'',replace)
}
qui graph twoway scatter `z``i''' `latent', name(residuals``i'',replace) title("Standardized residuals associated to ``i''") `fs'
}
*set trace off
qui gen `z2``i'''=(`z``i''')^2
qui su `z2``i'''
local OUTFIT``i''=`r(mean)'
qui matrix `fit'[`i',1]=`OUTFIT``i'''
local OUTFITs``i''=((`r(mean)')^(1/3)-1)*(3/sqrt(`q2o``i'''))+sqrt(`q2o``i''')/3
qui matrix `fit'[`i',3]=`OUTFITs``i'''
qui su `Inf``i''' if ``i''!=.
local sumw``i''=r(sum)
qui gen `i``i'''=`Inf``i'''*`z2``i'''
qui su `i``i''' if ``i''!=.
local INFIT``i'' = `=`r(sum)'/`sumw``i''''
qui matrix `fit'[`i',2]=`INFIT``i'''
local INFITs``i''=(`=`r(sum)'/`sumw``i''''^(1/3)-1)*(3/sqrt(`q2i``i'''))+sqrt(`q2i``i''')/3
qui matrix `fit'[`i',4]=`INFITs``i'''
di abbrev("``i''",19) _col(35) %5.3f `OUTFIT``i''' _col(50) %5.3f `INFIT``i''' _col(64) %6.3f `OUTFITs``i''' _col(79) %6.3f `INFITs``i'''
}
di as text "{hline 90}"
di as text "*: As suggested by Wright (Smith, 1998)
di as text "**: As suggested by Bond and Fox (2007)
set trace off
/*************************************************************************************************************
Categories/Items/Test Characteristics Curves and Information graphs
*************************************************************************************************************/
if "`graphs'"!="" {
tempfile savefile
qui save `savefile'
qui clear
qui set obs 2000
qui gen u=(_n-1000)/250
qui gen Tcum=0
qui gen TInf=0
forvalues i=1/`nbitems' {
local scatteri`i'
forvalues g=1/`nbgroups' {
local x=`groups'[`g',`=`nbitems'+1']
local y=`groups'[`g',`i']
local s1=`groups'[`g',`=`nbitems'+2']
local seuil=30
local s vtiny
*set trace on
foreach lab in tiny vsmall small medsmall medium medlarge large vlarge huge vhuge /*ehuge*/ {
if `s1'>`seuil' {
local s `lab'
}
local seuil=`seuil'+10
}
local scatteri`i' `scatteri`i'' || scatteri `y' `x' , mcolor(black) msize(`s') legend(off)
*set trace off
}
local d=1
qui gen cum``i''=0
*set trace on
if "`rsm'"=="" {
local mm=`modamax``i'''
}
else {
local mm `modamax'
}
forvalues k=1/`mm' {
local d `d'+exp(`k'*u-`diffmat2'[`i',`k'])
}
qui gen c0_``i''=1/(`d')
label variable c0_``i'' "Pr(``i''=0)"
forvalues k=1/`mm' {
qui gen c`k'_``i''=exp(`k'*u-`diffmat2'[`i',`k'])/(`d')
qui replace cum``i''=cum``i''+c`k'_``i''*`k'
label variable c`k'_``i'' "Pr(``i''=`k')"
}
qui gen Inf``i''=0
forvalues k=1/`mm' {
qui replace Inf``i''=Inf``i''+(`k'-cum``i'')^2*c`k'_``i''
}
if "`graphitems'"=="" {
if "`filesave'"!="" {
local fsc saving(`dirsave'//CCC_``i'',replace)
local fsi saving(`dirsave'//ICC_``i'',replace)
}
qui graph twoway line c*_``i'' u , name(CCC``i'', replace) title(Categories Characteristic Curve (CCC) of ``i'') ytitle("Probability") xtitle("Latent trait") `fsc'
qui graph twoway line cum``i'' u, name(ICC``i'',replace) title("Item Characteristic Curve (ICC) of ``i''") ytitle("Score to the item") xtitle("Latent trait") `scatteri`i'' `fsi'
}
qui replace Tcum=Tcum+cum``i''
qui replace TInf=TInf+Inf``i''
label variable Inf``i'' "``i''"
}
if "`filesave'"!="" {
local fst saving(`dirsave'//TCC,replace)
local fsteo saving(`dirsave'//TCCeo,replace)
local fsi saving(`dirsave'//ICC,replace)
local fsti saving(`dirsave'//TIC,replace)
local fsm saving(`dirsave'//map,replace)
}
qui graph twoway line Tcum u, name(TCC,replace) title("Test Characteristic Curve (TCC)") ytitle("Score to the test") xtitle("Latent trait") `fst'
qui graph twoway line Inf* u, name(IIC,replace) title("Item Information Curves") ytitle("Information") xtitle("Latent trait") `fsi'
qui graph twoway line TInf u, name(TIC,replace) title("Test Information Curve") ytitle("Information") xtitle("Latent trait") `fsti'
local scatteri
forvalues g=1/`nbgroups' {
local x=`groups'[`g',`=`nbitems'+1']
local y=`groups'[`g',`=`nbitems'+3']
local s1=`groups'[`g',`=`nbitems'+2']
local seuil=30
local s vtiny
*set trace on
foreach lab in tiny vsmall small medsmall medium medlarge large vlarge huge vhuge /*ehuge*/ {
if `s1'>`seuil' {
local s `lab'
}
local seuil=`seuil'+10
}
local scatteri `scatteri' || scatteri `y' `x' , mcolor(black) msize(`s') legend(off)
}
qui graph twoway line Tcum u , name(TCCeo,replace) title("Test Characteristic Curve (TCC)") ytitle("Score to the test") xtitle("Latent trait") `scatteri' `fsteo'
/*************************************************************************************************************
MAP
*************************************************************************************************************/
gen eff=0
local effmax=0
forvalues g=1/`nbgroups' {
local eff=`groups'[`g',`=`nbitems'+2']
if `groups'[`g',`=`nbitems'+2']>`effmax' {
local effmax=`groups'[`g',`=`nbitems'+2']
}
local lat=round(`groups'[`g',`=`nbitems'+1'],0.004)
*di "replace eff=`eff' if round(u,0.004)==`lat'"
qui replace eff=`eff' if round(u,0.004)==`lat'
}
gen density=normalden(u)*sqrt(`covariates'[1,1])
label variable eff "Frequencies"
label variable u "Latent trait"
label variable TInf "Information curve"
label variable density "Density function of the latent trait"
local scatteri
qui su u if eff!=0
local floor=floor(`r(min)')
local ceil=ceil(`r(max)')
forvalues i=1/`nbitems' {
local color`i':word `i' of `color'
local y=-`i'*`effmax'/`nbitems'
forvalues l=1/`modamax' {
local x=`diffmat'[`i',`l']
local scatteri `scatteri' || scatteri `y' `x' "`l'" ,mcolor(black) mlabcolor(black)
if `x'<`floor' {
local floor=floor(`x')
}
if `x'>`ceil' {
local ceil=ceil(`x')
}
}
local scatteri `scatteri' || scatteri `y' `floor' "``i''",mcolor(black) mlabcolor(black) msize(vtiny)
}
qui su eff
local maxe=ceil(`=(floor(`r(max)'/10)+1)*10')
qui su TInf
local maxi=ceil(`r(max)')
qui su density
local maxd=ceil(`r(max)')
qui drop if u<`floor'|u>`ceil'
qui graph twoway (bar eff u, barwidth(.2) yaxis(1) legend(off) xlabel(`floor'(1)`ceil')) (line TInf u,yaxis(2)) (line density u,yaxis(3)) `scatteri' , name(map,replace) ytitle("Frequencies") ylabel(-`maxi'(`=`maxi'/5')`maxi' ,axis(2)) ylabel(-`maxd'(`=`maxd'/5')`maxd' ,axis(3)) ylabel(-`maxe'(`=`maxe'/5')`maxe' ,axis(1)) title("Individuals/items representations (Map)") xsize(12) ysize(9) note("Red line: Information curve - Green line : Density of the latent trait") xtitle("Latent trait") `fsm'
qui clear
qui use `savefile'
}
/*************************************************************************************************************
RESULTS BY GROUP
*************************************************************************************************************/
di
di as text "{hline 57}"
di _col(31) "Latent Variable" _col(50) "Expected"
di "Group" _col(10) "Score" _col(20) "Freq" _col(32) "Mean" _col(42) "s.e." _col(53) "Score"
di as text "{hline 57}"
*set trace on
forvalues g=1/`nbgroups' {
qui count if `group'==`g'
local eff`g'=r(N)
qui count if `score'!=.&`group'==`g'
local n=r(N)
di as text "`g' (n=" as result `eff`g'' as text ")" _c
if `n'>0 {
qui su `score' if `group'==`g'
local scoremin`g'=`r(min)'
local scoremax`g'=`r(max)'
forvalues s=`scoremin`g''/`scoremax`g'' {
qui count if `group'==`g'&`score'==`s'
local eff=r(N)
qui su `latent' if `group'==`g'&`score'==`s'
local mean=r(mean)
qui su `selatent' if `group'==`g'&`score'==`s'
local se=r(mean)
qui su `Tcum' if `group'==`g'&`score'==`s'
local exp=r(mean)
if `eff'>0 {
di as text _col(10) %5.0f `s' as result _col(20) %4.0f `eff' _col(30) %6.3f `mean' _col(40) %6.3f `se' _col(53) %5.2f `exp'
}
}
}
qui count if `group'==`g'&`score'==.
local eff=r(N)
qui su `latent' if `group'==`g'&`score'==.
local mean=r(mean)
qui su `selatent' if `group'==`g'&`score'==.
local se=r(mean)
qui su `Tcum' if `group'==`g'&`score'==.
local exp=r(mean)
if `eff'>0 {
di as text _col(10) " ." as result _col(20) %4.0f `eff' _col(30) %6.3f `mean' _col(40) %6.3f `se' _col(53) %5.2f `exp'
}
di as text "{hline 57}"
}
/*************************************************************************************************************
CREATION DU DOCX
*************************************************************************************************************/
if "`docx'"!="" {
putdocx clear
putdocx begin
putdocx paragraph
putdocx text ("General informations") , bold underline font(,14) smallcaps
putdocx paragraph
putdocx text ("Number of individuals: `nbobs'")
putdocx paragraph
putdocx text ("Number of complete individuals: `nbobsssmd'")
putdocx paragraph
putdocx text ("Number of items: `nbitems'")
putdocx paragraph
putdocx text ("List of items: `varlist'")
putdocx paragraph
putdocx text ("Date: $S_DATE, $S_TIME")
putdocx paragraph
local model Partial Credit Model (PCM)
if "`rsm'"!="" {
local model Rating Scale Model (RSM)
}
putdocx text ("Model: `model'")
putdocx paragraph
putdocx text ("Marginal log-likelihood: `ll'")
putdocx paragraph
putdocx text ("Estimation of the parameters") , bold underline font(,14) smallcaps
putdocx table tablename = matrix(`diff') , nformat(%9.3f) rownames colnames border(start, nil) border(insideH, nil) border(insideV, nil) border(end, nil)
putdocx table tablename = matrix(`covariates') , nformat(%9.3f) rownames colnames border(start, nil) border(insideH, nil) border(insideV, nil) border(end, nil)
putdocx paragraph
putdocx text ("Fit indexes for items") , bold underline font(,14) smallcaps
putdocx table tablename = matrix(`fit') , nformat(%9.3f) rownames colnames border(start, nil) border(insideH, nil) border(insideV, nil) border(end, nil)
local extension png
}
/*************************************************************************************************************
SAUVEGARDE DES GRAPHIQUES
*************************************************************************************************************/
*set trace on
if "`filesave'"!="" {
if "`graphs'"!="" {
if "`docx'"!="" {
putdocx pagebreak
putdocx paragraph
putdocx text ("General graphs") , bold underline font(,14) smallcaps
}
foreach i in TCC TCCeo TIC IIC map {
if "`extension'"!="" {
qui graph export `dirsave'//`i'.`extension', replace name(`i')
}
*graph display `i'
*qui graph save `dirsave'//`i', replace
if "`docx'"!="" {
putdocx paragraph
putdocx image `dirsave'//`i'.png, height(10cm)
}
}
*discard
if "`graphitems'"=="" {
forvalues i=1/`nbitems' {
if "`docx'"!="" {
putdocx paragraph
putdocx text ("Graphs for ``i''") , bold underline font(,14) smallcaps
}
foreach j in CCC ICC residuals {
*graph display `j'``i''
*qui graph save `dirsave'//`j'_``i'', replace
if "`extension'"!="" {
qui graph export `dirsave'//`j'_``i''.`extension', replace name(`j'``i'')
}
if "`docx'"!="" {
putdocx paragraph
putdocx image `dirsave'//`j'_``i''.png , height(10cm)
}
}
}
}
}
}
if "`docx'"!="" {
putdocx save `dirsave'//`docx'.docx, replace
}
/*************************************************************************************************************
RETURNS
*************************************************************************************************************/
matrix colnames `diff'=Estimate "s.e." z p lb ul
matrix colnames `covariates'=Estimate "s.e." z p lb ul
matrix rownames `diff'=`diffname'
matrix rownames `covariates'=Variance `continuous' `catname'
return matrix difficulties=`diff'
return matrix covariates=`covariates'
restore, preserve
end