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Table 3 Overall model fit for identity scales—engineering

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

 

CFA

IRT

Scales

χ

df

RMSEA

CFI

TLI

C2 a

df

RMSEA

CFI

TLI

SRMSR

COMP

54.26*

14

.123

.948

.923

37.97*

14

.095

.962

.943

.068

INT

24.40

14

.064

.994

.991

14.73

14

.017

.999

.999

.042

SELF

11.89

9

.042

.999

.999

9.76

9

.022

.999

.999

.030

OTHERS

42.55*

9

.145

.989

.981

31.83*

9

.119

.977

.961

.047

  1. COMP competence, INT interest, SELF self-recognition, OTHERS recognition by others
  2. *p < .01
  3. aC2 is a variant of the M2 statistic (Maydeu-Olivares & Joe, 2006) for evaluating model fit; C2 is appropriate for polytomous models when there is not sufficient degrees for freedom (e.g., due to low small number of items)