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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