IRT mixtur model with auxiliary varia... PreviousNext
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 ARMEL BRIZUELA R posted on Thursday, January 29, 2015 - 4:24 pm
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.
 Tihomir Asparouhov posted on Friday, January 30, 2015 - 9:15 am
You can use the manual 3-step approach described in Section 3 of
http://statmodel.com/download/webnotes/webnote15.pdf
 ARMEL BRIZUELA R posted on Friday, January 30, 2015 - 9:36 am
Thank you very much, Dr. Asparouhov. I really appreciate your help.
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