Dear R Users, I am using the LLTM and the LRSM functions in the eRm package to do repeated measurements where there are 2 measurement points for a list of 10 items. I am trying to get ability estimates but am having trouble. I don't think that it is appropriate to use the pmat function since the person parameters are based on all 20 items. Rather, I think it would be more appropriate to have the person parameters be based on the 10 items at Time 1 and then the next 10 items at Time 2. However, I don't want to form 2 separate Rasch models since I think it's important to have all 20 item parameters calculated at once.
Any advice would be greatly appreciated. Also, if more information is needed, I could send my sample code. Best, Kim -- View this message in context: http://www.nabble.com/Ability-Estimates-for-Repeated-Measurements-in-the-eRm-Package-tp25260278p25260278.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
