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Some discrimination parameters equal ... |
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Evgenia posted on Monday, May 09, 2011 - 1:37 am
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How can I set equal discrimination parameters for only some of my items in a 2 parameter IRT model? If I have a 5 items and Rasch model(all discrimination parameters equal) I have Model: f by u1-u5* (1); f@1; Now I want only u1:u3 to be equal the other two discimination parameters to be freely estimated Thanks |
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Is this what you mean: f BY u1* (1) u2 u3 (1) u4; |
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Evgenia posted on Monday, May 09, 2011 - 6:30 am
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When I wrote u1:u3 I mean u1=u2=u3 but after your reply I manage to write exactly what I want as MODEL:f BY u1* (1) u2(1) u3(1) u4 u5; !only b1-b2-b3 equal f@1; Thanks alot |
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