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Table 2 Overall fit statistics for the combined dataset

From: Applying Rasch analysis to evaluate measurement equivalence of different administration formats of the Activity Limitation scale of the Cambridge Pulmonary Hypertension Outcome Review (CAMPHOR)

Scale Item-trait interaction PSI Item-person fit residuals Unidimensionality (95 % Confidence Interval)
Chi2 P-value Item fit residual Person fit residual
Mean SD Mean SD
Activity limitation 0.027 0.907 −0.77 0.99 −0.45 1.02 0.064 (0.042–0.085)
Ideal values >0.003a >0.8 0 ± 1 0 ± 1 <0.05
  1. aBonferroni adjusted