Hello, I am conducting a two-parameter logistic IRT model, to analyse 50 multiple choice items for 375 students, I followed the example provided in the guide (i.e., example 5.5) and I got the values of the items. However, I need the theta or (ability) or IRT score for each student. Can you please help me on how to do that if it is possible.
Muthen thanks a lot, but still have a question, after I have done what you suggested I end up with 53 columns, the first 50 I think they represents the scores of the 50 MC items used in the analysis,and the column number 51 is the ID numbers after that there are two more columns and I think one of them is what I'm looking for (i.e., students' location or scores)however, I am not sure what does each column represents and not sure which one of them is the student theta? So my question now is that what does each column means? Regards