PROC IRT: estimate latent traits with KNOWN item parameters

[Audrey123]

Hello, I am wondering if it possible (if so, how) to pass already known item parameters to SAS to estimate latent traits. Thanks!

[PatrickYang]

Yes, it is possible to do. Given item parameter estimates, you can do subject scoring (i.e., computing scores for subjects). Refer to Example 5 of PROC IRT documentation: Subject Scoring.