[Rasch] Difficulty Performing Rasch Analysis in R.

Nicholas Commons-Miller ncommons at gmail.com
Tue May 3 09:16:02 AEST 2016


Dear Rasch listserv,

I am trying to analyze my data, which has 67 binary items and 5 ternary 
items. I am trying to analyze it using a package called eRm (version 
0.15-6) in R statistics. I am successful able to analyze the first 67 
items using basic Rasch analysis, but I am failing to analyze the entire 
set of items at once. I have tried to do it with RSM, PCM, and LRSM (all 
included in the eRm package), but have not been successful with any of 
them. Conceptually, I think that LRSM should be the correct one.

I have attached the data in TXT format. It consists of 72 columns (the 
items) and 80 rows (the participants).

Any insight on which analysis to use and how to use it would be greatly 
appreciated.

My best,
Nicholas Commons-Miller
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