Jeff
2012-Mar-28 06:22 UTC
[R] Getting a complete vector of Theta estimates from Package LTM
I'm new to R and this list. I'm using the LTM package for the first time to estimate Rasch and grm models. I've searched the web and the list archives and have found an almost identical question to my current one, but I haven't found an answer. I'm going to repeat the question that someone else asked two years ago (March 20, 2010) to see if anyone can provide an answer to this issue. I am using package LTM to estimate a Rasch model: irtestimates <- rasch(binRasch) I want to get a single vector containing theta estimates for all the rows (individuals) in my data matrix (hopefully in the same order as my data matrix) such that the length of the theta vector = the number of rows (participants) in my data matrix. I am using: theta.est <- factor.scores(irtestimates,method="EAP") The problem is that this does not return a vector of ALL the theta estimates, rather it gives me a summary of theta estimates associated with each response pattern in my data along with the number of times each response pattern occurs. Any ideas on how to get the complete vector of theta estimates? Thanks,