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Table 1 Summary statistics from the dichotomous Rasch model

From: Exploring student understanding of the engineering design process using distractor analysis

Statistic

Student (N = 128)

Item (N = 20)

Location (logits)

 M

0.11

0.00

 SD

0.92

0.63

Standard error

 M

0.52

0.20

 SD

0.07

0.01

Infit MSE

 M

1.00

1.00

 SD

0.14

0.14

Outfit MSE

 M

1.01

1.01

 SD

0.22

0.21

Separation statistics

 Reliability of separation

0.68

0.90

 Chi-Square

332.7*

181.7*

 Degrees of freedom

127

19

  1. *p < 0.05