SPSSINC RASCH works generally well, but fails to provide the PERSONFITDATA as a new datasheet.
A new datasheet appears with a complete dicitionary and the expected number of available response combinations but only filled with system-missing-values.
I'am using a german language and locales Installation of SPSS Release 18.104.22.168, R version 2.12.1 and package 'ltm' version '0.9-7' built under R version 2.13.2.
Any ideas/suggestions what to do?
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Re: SPSSINC RASCH - PERSONFITDATA is missing2013-01-02T13:41:51ZThis is the accepted answer. This is the accepted answer.Sorry that this response has taken a while.
We have identified and fixed a bug in the SPSSINC RASCH command that caused the values in the dataset to all be missing. We will post a new version to the SPSS Community website in the Extension Commands Collection as soon as it is approved by IBM Legal. That will probably take a week or so.
Re: SPSSINC RASCH - PERSONFITDATA is missing2013-01-08T23:32:48ZThis is the accepted answer. This is the accepted answer.
Re: SPSSINC RASCH - PERSONFITDATA is missing2013-01-15T15:48:57ZThis is the accepted answer. This is the accepted answer.Dear Jon Peck,
many thanks for your effort!
In the meantime I solved the task directly with R's ltm. But next time I will try your extension command again.
By the way: Are you thinking about implementing the 2PL-model as well? It serves well in identifiying items with deviating discrimination parameters.