I am using the factor.scores procedure in the ltm package to calculate theta values in a grm model. I need to retain individual subject IDs (which I have) and have not been able to do so. In addition the procedure re-orders the observations based on item response patterns. The only information included in the output are item responses, theta values, and standard errors for each individual. I need to be able to match the theta values with additional variables in another data set. Any help would be appreciated.

Jacob T. Lutz, M.A.
Doctoral Candidate
School Psychology Program
Ball State University
E-mail: jtlutz@bsu.edu<mailto:jtlutz@bsu.edu>




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