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IRT mixtur model with auxiliary varia... |
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I am trying to estimate an IRT mixture model with one continuous auxiliary variable (subjects age): VARIABLE: Names = age u1-u15; Categorical = u1-u15; Classes = c(2); Auxiliary = age(bch); DATA: File = auxiliares.dat; ANALYSIS: Type = Mixture; ALGORITHM = INTEGRATION; STARTS = 50 5; PROCESS = 4; MODEL: %OVERALL% f BY U1-U15; [f@0]; %c#1% f BY u1@1 u2-u15; f; [u1$1-u15$1]; %c#2% f BY u1@1 u2-u15; f; [u1$1-u15$1]; OUTPUT: TECH1 TECH8; I obtained the following output: *** ERROR in VARIABLE command Auxiliary variables with R3STEP, DU3STEP, DE3STEP, DCATEGORICAL, DCONTINUOUS, or BCH are not available with TYPE=MIXTURE in conjunction with ALGORITHM=INTEGRATION. Is there another algorithm in order to estimate this model? Thanks in advance for your help. |
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You can use the manual 3-step approach described in Section 3 of http://statmodel.com/download/webnotes/webnote15.pdf |
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Thank you very much, Dr. Asparouhov. I really appreciate your help. |
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