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Table 6 Comparison of the Capabilities of each Software Package

From: A comparison of the polytomous Rasch analysis output of RUMM2030 and R (ltm/eRm/TAM/lordif)

  RUMM2030 R-ltm R-eRm R-TAM R-lordif
Model Fit Statistics YES YES YES YES NO
Unidimensionality YES YESa YESd YES NO
Category Thresholds YES NO YES YES YES
DIF YES YESa YESa YES YES
Local Independence YES YES YES YES NO
Reliability YESb YESc YESe YESf NO
  1. a Dichotomous Data Only
  2. b Person Separation Index
  3. c Cronbach’s Alpha
  4. d Martin-Loef-Test
  5. e Conditional maximum likelihood framework
  6. g EAP and WLE reliability statistics
  7. g Joint maximum likelihood