James L. Lewis
2010-Mar-20 04:40 UTC
[R] Getting a complete vector of Theta estimates from Package LTM
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, Jimmy