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Table 8 Item fit and item parameter estimates for identity scales—STEM

From: Development and validation of the role identity surveys in engineering (RIS-E) and STEM (RIS-STEM) for elementary students

  

Item fit

Item parameter estimatesa

Scales

Item ID

S_X2*

df

RMSEA

a

b1

b2

b3

Competence

Comp1

40.02

31

.02

1.27

− 1.51

0.04

1.67

Comp2

28.41

30

.00

1.59

− 2.01

− 1.00

0.76

Comp3

45.39

32

.03

1.06

− 1.55

0.15

2.16

Comp4

34.86

31

.01

1.44

− 1.86

− 0.73

0.89

Comp5

22.52

29

.00

1.82

− 1.81

− 0.82

0.74

Comp6

29.61

28

.01

1.78

− 2.01

− 0.84

0.91

Comp7

32.61

30

.01

1.65

− 2.05

− 0.67

1.16

Interest

Int1

65.10

40

.03

0.75

− 3.62

− 1.97

− 0.11

Int2

39.96

34

.02

0.85

− 4.15

− 2.66

0.18

Int3

27.38

29

.00

2.08

− 1.51

− 0.57

0.84

Int4

46.78

33

.03

1.28

− 1.42

0.11

1.31

Int5

53.56

26

.04

2.73

− 1.45

− 0.72

0.64

Int6

34.70

26

.02

2.99

− 1.37

− 0.67

0.56

Int7

38.21

28

.02

2.32

− 1.33

− 0.45

0.69

Self-recognition

Self1

32.77

29

.01

1.59

− 1.39

− 0.18

1.05

Self2

29.25

29

.00

1.44

− 1.80

− 0.55

0.85

Self3

27.79

24

.02

2.46

− 0.67

0.42

1.23

Self4

25.55

24

.01

2.71

− 0.64

0.46

1.23

Self5

33.46

25

.02

2.29

− 0.72

0.43

1.24

Self6

33.11

30

.01

1.59

− 1.20

− 0.14

1.07

Recognition by others

Oth1

107.60*

27

.07

2.26

− 1.07

− 0.03

0.91

Oth2

42.54

22

.04

3.36

− 0.71

0.19

0.96

Oth3

49.98*

23

.04

3.09

− 0.78

0.10

0.77

Oth4

63.02*

29

.04

1.62

− 1.34

− 0.11

0.97

Oth5

85.10*

27

.06

2.25

− 1.01

0.05

1.13

Oth6

34.50

19

.04

3.39

− 0.63

0.30

1.14

  1. *p < .01
  2. aItem parameters in graded response model include a—discrimination and b1–b3—step difficulties (analogous to thresholds in CFA)