From: A comparison of the polytomous Rasch analysis output of RUMM2030 and R (ltm/eRm/TAM/lordif)
RUMM2030 | R- ltm/eRm/TAM/lordif | ||
---|---|---|---|
Model Fit Statistics | Pain | Acceptable Item and Person Fit | Acceptable Item and Person Fit |
Specific Activities | Acceptable Item and Person Fit | Acceptable Item and Person Fit | |
Usual Activities | Acceptable Item and Person Fit | Acceptable Item Fit Unacceptable Person Fit | |
Unidimensionality | Pain | Unidimensionality Present | Unidimensionality Present |
Specific Activities | Unidimensionality Present | Unidimensionality Present | |
Usual Activities | Unidimensionality Not Present | Unidimensionality Present | |
Category Thresholds | Pain | Disordered - Item #5 | Ordered |
Specific Activities | Ordered | Ordered | |
Usual Activities | Disordered - Items #3 & 4 | Ordered | |
Differential Item Functioning | Pain | Non-uniform DIF – Item #4 for age | Non-uniform DIF – Item #4 for age |
Specific Activities | Uniform DIF – Item #4 for age | Uniform DIF – Item #4 for age, item #6 for sex | |
Usual Activities | None Detected | Non-uniform DIF – Item #2 for sex | |
Local Independence | Pain | Local Dependency - Items #1 & 5 | No Local Dependency |
Specific Activities | Local Dependency - Items #1 & 2 | No Local Dependency | |
Usual Activities | No Local Dependency | No Local Dependency |