Author Topic: Person parameters in within-item multidimensional models  (Read 448 times)

Georg II

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Person parameters in within-item multidimensional models
« on: June 29, 2012, 03:57:30 PM »
Ray,
What's the reason of convergence failure for cases?
In a within-item multidimensional model ConQuest gives a message that there convergence failure. The person parameters are some unreadable mixture of some large numbers and characters, as shown below.
What should I do to get person ability estimates?
Thanks
Georg II

1.#QNAN   -1.#IND0    1.#QNAN   -1.#IND0    1.#QNAN   -1.#IND0    1.#QNAN   -1.#IND0    1.#QNAN   -1.#IND0    1.#QNAN   -1.#IND0    1.#QNAN   -1.#IND0
0.30120   -1.#IND0    1.25060   -1.#IND0    0.30120   -1.#IND0    0.30120   -1.#IND0    1.25060   -1.#IND0    1.25060   -1.#IND0   -5.60935   -1.#IND0
13.10653 47453132.81213   12.83898 47453132.81213   13.10653 47453132.81213   12.83898 47453132.81213   12.83916 47453132.81213   12.83916 47453132.81213  -12.79817 47453132.81213


ConQuest

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Re: Person parameters in within-item multidimensional models
« Reply #1 on: June 30, 2012, 03:23:32 AM »
This looks like a bug or an identification problem.  Please email me your data and control file and I will diagnose the problem.