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Table 5 HADS – Rating Scale Model Error rates by sample size (collapsing across items)

From: Rasch fit statistics and sample size considerations for polytomous data

HADS A Infit t Infit t Infit MNSQ Infit MNSQ Infit MNSQ Outfit t Outfit t Outfit MNSQ Outfit MNSQ Outfit MNSQ
  <-2 >2 <0.7 >1.2 >1.3 <-2 >2 <0.7 >1.2 >1.3
25 0 0 1 1 1 0 0 1 1 1
50 0 1 0 1 1 0 1 0 1 1
100 0 1 0 1 1 0 1 0 1 1
200 0 1 0 1 1 0 1 0 1 1
400 1 1 0 1 1 1 1 0 1 1
800 1 1 0 1 1 1 1 0 1 1
1600 5 1 0 1 1 4 1 0 1 1
3200 5 1 0 1 1 4 1 0 1 1
HADS D Infit t Infit t Infit MNSQ Infit MNSQ Infit MNSQ Outfit t Outfit t Outfit MNSQ Outfit MNSQ Outfit MNSQ
  <-2 >2 <0.7 >1.2 >1.3 <-2 >2 <0.7 >1.2 >1.3
25 0 0 0 2 2 0 0 1 2 1
50 0 0 0 2 2 0 0 1 1 1
100 0 0 0 2 2 1 0 1 2 2
200 0 2 0 2 2 1 0 0 2 0
400 1 2 0 2 1 1 1 0 1 1
800 1 2 0 2 2 2 1 1 1 1
1600 2 3 0 2 2 3 3 0 1 1
3200 2 3 0 2 2 3 3 0 1 1
  1. The number of items exceeding the fit criteria are shown in each column