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Table 2 Mean, standard deviation, minimum and maximum of measurement, infit, outfit, and error for items and person

From: Comparison of formula and number-right scoring in undergraduate medical training: a Rasch model analysis

 

Items

Person

Measure

Infit

Outfit

Error

Measure

Infit

Outfit

Error

Test 1

FS

Mean

0.00

1.00

1.00

0.12

0.32

1.04

1.00

0.13

SD

0.55

0.05

0.10

0.05

0.25

0.37

0.41

0.01

Minimum

−1.85

0.91

0.52

0.05

−0.38

0.41

0.36

0.11

Maximum

1.55

1.22

1.48

0.38

1.54

2.51

2.21

0.21

NR

Mean

0.00

1.00

1.00

0.20

0.24

1.00

1.00

0.23

SD

1.17

0.06

0.10

0.07

0.50

0.09

0.20

0.01

Minimum

−4.15

0.84

0.79

0.17

−1.32

0.81

0.72

0.22

Maximum

2.57

1.12

1.37

0.71

1.57

1.29

2.58

0.26

 

FS

Mean

0.00

1.00

1.03

0.12

0.33

1.03

1.03

0.12

Test 2

SD

0.59

0.05

0.14

0.05

0.25

0.35

0.44

0.01

Minimum

−2.68

0.90

0.83

0.05

−0.31

0.27

0.34

0.11

Maximum

1.71

1.25

2.02

0.39

1.27

2.14

3.46

0.18

NR

Mean

0.00

1.00

0.99

0.18

0.24

1.00

0.99

0.22

SD

0.90

0.06

0.10

0.03

0.51

0.10

0.15

0.01

Minimum

−2.32

0.85

0.66

0.17

−1.53

0.78

0.66

0.22

Maximum

2.42

1.13

1.19

0.30

1.75

1.32

1.53

0.27

  1. FS formula-scoring group, NR number-right scoring group