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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