Rasch analysis using R plug-in

[E. Bernardo]

Hi Listers,

I am using spss 16. I already installed the R plug-in and R 2.5.  I would like to do a Rasch Analysis for my data.  How would I do it? Please advise.

 

Thank you.

Eins

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[Peck, Jon]

Here is a Rasch program (generated by the spssinc rasch extension command in 17).

All you should need to make this work in 16 is to change the variable names x1,… below.

Note that you need to install the R ltm module for this to work.

 

HTH,

Jon Peck

 

 

BEGIN PROGRAM R.

library(ltm)

dta<-spssdata.GetDataFromSPSS("x1 x2 x3 x4 x5")

# convert NaN values to NA

is.na(dta) <- is.na(dta)

 

res <- tryCatch(

    summary(

        fit<-rasch(data=dta,

          na.action=na.exclude )

    ),

error=function(e)

    {return(c("ERROR:",e))}

)

 

if (!is.null(res$message)) {print(res$message);break} else {

spsspivottable.Display(res$coefficients,

title=paste("SPSSINC Rasch"),"SPSSINCRasch",

  caption=c(res$call),

 isSplit=FALSE)

 }

 

if (is.null(fit$message)) {

spssdictionary.EndDataStep()

}

rm(dta)

rm(res)

rm(fit)

END PROGRAM   .

 

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From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Eins Bernardo
Sent: Friday, April 10, 2009 10:27 AM
To: [hidden email]
Subject: [SPSSX-L] Rasch analysis using R plug-in

 

Hi Listers,

I am using spss 16. I already installed the R plug-in and R 2.5.  I would like to do a Rasch Analysis for my data.  How would I do it? Please advise.

 

Thank you.

Eins

 

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