Not sure I completely understand what you want. You might try looking at the irt.ability() function in the MiscPscyho package for ability estimates.
> -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of Tessari > Sent: Wednesday, September 02, 2009 11:50 AM > To: r-help@r-project.org > Subject: [R] Ability Estimates for Repeated Measurements in > the eRm Package > > > 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-Measureme nts-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. > ______________________________________________ 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.
