[R] Getting a complete vector of Theta estimates from Package LTM
Jeff
r at jp.pair.com
Wed Mar 28 08:22:05 CEST 2012
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,
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