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Table 7 HADS – Partial Credit 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 0 1 1 0 0 1 1 1
50 0 1 0 1 1 0 0 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 2 1 0 1 1 2 1 0 1 1
800 3 1 0 1 1 3 1 0 1 1
1600 3 2 0 1 1 3 2 0 1 1
3200 4 2 0 1 1 4 2 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 1 1 0 0 0 1 2 2
50 0 0 0 2 0 0 0 1 1 1
100 1 0 1 1 0 0 0 1 2 2
200 1 0 0 0 0 0 1 1 1 1
400 1 1 0 0 0 1 1 1 1 1
800 1 1 0 0 0 2 1 1 1 1
1600 2 3 0 0 0 2 2 1 2 1
3200 3 3 0 0 0 3 3 1 2 1