TEST-OF-FIT STATISTICS

            Question:

What limitations apply to test-of-fit statistics used in RUMM2030?

            Explanation:

Overall:  the tests-of-fit employed by RUMM2030 for a Rasch analysis should be used relatively, and not strictly absolutely according to external criteria.

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            Question:

How do RUMM2030 fit indices relate to OUTFIT and INTFIT statistics used in other programs?

            Explanation:

The outfit and infit statistics used in other programs are similar to the Residual statistic in RUMM2030:

These values are differently weighted statistics based on the residual between a person's response and the expected response according to the model given the person and item estimates.

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