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67 lines
1.5 KiB
Plaintext
67 lines
1.5 KiB
Plaintext
8 months ago
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program define predraschwlm,rclass
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syntax varlist , genlt(string) id(string)
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tempfile filesave
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qui save `filesave',replace
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tempname diff theta
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matrix `diff'=r(beta)
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matrix `theta'=r(theta)
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qui count
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local N=r(N)
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tokenize `varlist'
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local nbitems:word count `varlist'
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tempname item offset id
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qui gen `id'=_n
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forvalues i=0/`nbitems' {
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local thetascore`i'=`theta'[1,`=`i'+1']
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}
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tempname nbmiss
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qui egen `nbmiss'=rowmiss(`varlist')
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tempfile s
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qui save `s',replace
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forvalues i=1/`N' {
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use `s',clear
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if `nbmiss'[`i']!=0 {
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local w`i'=0
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local l`i'=1
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forvalues j=1/`nbitems' {
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local item`j'=``j''[`N']
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local diff`j'=`diff'[1,`j']
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local rep`i'_`j'=``j''[`i']
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if `rep`i'_`j''!=. {
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local w`i' `w`i''+exp(x-`diff`j'')/(1+exp(x-`diff`j''))^2
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local l`i' `l`i''*exp(`rep`i'_`j''*(x-`diff`j''))/(1+exp(x-`diff`j''))
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}
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}
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local w`i' sqrt(`w`i'')
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*di "`i'"
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clear
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qui set obs 20001
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qui gen u=_n
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qui gen x=(u-10001)/1000
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qui gen f=`w`i''*`l`i''
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qui gsort -f
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local tl`i'=x[1]
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}
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}
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qui use `filesave',clear
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qui capture drop `genlt'
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qui gen `genlt'=.
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tempname scores
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qui genscore `varlist',score(`scores')
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forvalues i=0/`nbitems' {
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qui replace `genlt'=`thetascore`i'' if `scores'==`i'
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}
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forvalues i=1/`N' {
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if `genlt'[`i']==. {
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qui replace `genlt'=`tl`i'' in `i' if `genlt'==.
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}
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}
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end
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