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Help desk => Questions and Answers => Topic started by: Georg II on June 29, 2012, 03:57:30 PM

Title: Person parameters in within-item multidimensional models
Post by: Georg II 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

Title: Re: Person parameters in within-item multidimensional models
Post by: ConQuest 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.