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Table 7 Comparison of the Results Obtained from RUMM2030 and R ltm/eRm/TAM/lordif

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