Skip to main content

Table 4 Fit statistics for PHQ-9 items (collapsed across sample size) for the Partial Credit Model

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

  Infit MNSQ SE Infit t SE Outfit MNSQ SE Outfit t SE
PHQ1 0.98 0.01 -0.02 0.09 0.96 0.02 -0.27 0.11
PHQ2 0.79 0.01 -2.99 0.07 0.74 0.01 -3.19 0.07
PHQ3 1.17 0.01 2.95 0.08 1.17 0.02 2.55 0.10
PHQ4 1.01 0.01 0.05 0.08 0.98 0.01 -0.25 0.08
PHQ5 1.22 0.01 2.47 0.08 1.30 0.03 1.93 0.09
PHQ6 0.95 0.01 -0.36 0.07 0.97 0.03 -0.26 0.08
PHQ7 0.91 0.01 -1.00 0.07 0.86 0.02 -1.04 0.07
PHQ8 1.05 0.02 0.34 0.08 0.95 0.03 -0.08 0.08
PHQ9 0.92 0.02 -0.22 0.06 1.00 0.10 -0.41 0.10
>1.30 0 >2 2.00 >1.30 0 >2 1.00  
<0.70 0 <-2 1.00 <0.70 0 <-2 1.00