Table 2 Item parameter estimates and standard errors from the graded response model in the developmental sample

1.15

.04

2.45

.07

2.97

.09

2.54

.1

2.28

.04

2.98

.06

2.02

.07

2.16

.04

2.78

.06

1.96

.07

2.38

.05

3.0

.07

1.2

.04

2.22

.06

3.57

.10

1.80

.05

1.74

.03

2.69

.06

2.73

.12

2.44

.05

3.01

.07

3.29

.11

1.75

.02

2.39

.04

2.36

.1

2.52

.05

3.27

.08

2.41

.07

1.83

.03

2.62

.05

3.4

.11

1.64

.02

2.42

.04

1.28

.03

1.11

.03

2.61

.06

1.98

.06

1.62

.03

2.48

.05

2.64

.09

2.11

.03

2.81

.06

1.46

.06

2.81

.08

3.31

.10

2.32

.06

1.52

.02

2.41

.04

2.13

.06

1.42

.02

2.32

.04