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Table 5 Descriptive statistics of item and person parameters

From: Developing a computer-based assessment of complex problem solving in Chemistry

Descriptive statistics

Item parameters

Person parameters

 

PUC

PR

PS

SRC

SUM

PUC

PR

PS

SRC

SUM

M

0.00

0.00

0.00

0.00

0.00

−0.45

0.12

−0.47

0.60

−0.04

SD

0.77

1.15

0.89

1.14

0.87

1.11

1.51

1.70

0.95

0.72

Min

−0.83

−1.49

−1.37

−1.91

−2.56

−3.17

−3.81

−3.70

−2.14

−2.01

Max

1.14

2.32

1.51

2.77

1.56

3.30

4.01

2.52

3.96

1.89

EAP/PV reliability

0.71

0.65

0.76

0.65

0.83

     

N Items

7

7

11

6

31

     
  1. SUM, overall problem-solving performance; EAP/PV, expected a posteriori over persons; NItems, number of items. In order to identify the scale, the means of the item parameters were constrained to zero.