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Table 4 Rasch summary statistics of expert ratings

From: Effects of rating criteria order on the halo effect in L2 writing assessment: a many-facet Rasch measurement analysis

  Difficulty Infit Outfit PTMEA
Rating criterion
 Content 0.38 (0.08) 1.06 1.05 .70
 Organization 0.85 (0.08) 1.02 0.97 .70
 Vocabulary − 0.09 (0.08) 1.02 1.07 .57
 Language use − 0.33 (0.08) 0.89 0.90 .66
Halo index
 Separation ratio 6.64  
 Separation index (Strata) 9.18  
 Reliability of trait separation .98  
 Fixed-effect (all same) chi-square statistic 133.5 (df = 3, p < .001)  
  1. Note. Standard errors of measurement are presented in parentheses. PTMEA = point-measure biserial correlation