Proc IRT: estimate latent trait by passing 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!

[Rick_SAS]

If you already have a fitted model, then you can use the INMODEL= option to specify a SAS data set that contains the model parameters. You can use the SCORE suboption to score new subjects without refitting the model. 

You can also use the INMODEL= option to provide initial values for parameter estimates when fitting a model. 

For details, see the documentation for the PROC IRT statement.