CHIDIM: a FORTRAN program for assessing the dimensionality of binary item responses based on McDonald's nonlinear factor analytic model.
The writers describe CHIDIM, a Fortran computer program for assessing the dimensionality of binary item responses based on McDonald's nonlinear factor analytic model. It is demonstrated that the program calculates the approximate chi-square statistic, which tests the null hypothesis that the off-di...
| Published in: | Educational & Psychological Measurement Vol. 57; pp. 174 - 179 |
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| Main Authors: | , |
| Format: | Article |
| Published: |
Sage Publications Inc.
February 1997
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| Subjects: | |
| Online Access: | View this record in EBSCOhost |
| Summary: | The writers describe CHIDIM, a Fortran computer program for assessing the dimensionality of binary item responses based on McDonald's nonlinear factor analytic model. It is demonstrated that the program calculates the approximate chi-square statistic, which tests the null hypothesis that the off-diagonal elements of a residual correlation matrix are equal to zero after fitting an n-factor model to a set of item responses. The use of this program and the interpretation of its results are illustrated through the simulated unidimensional responses of 1,000 examinees on a 25-item test. |
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