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International Journal of STEM Education

Table 5 Fit indices of the confirmatory factor analysis models describing SIT-PE test

From: Towards a science inquiry test in primary education: development of items and scales

Factor model

χ2

df

χ2/df

RMSEA

CFI

TLI

WRMR

Correlated factors

509.019

242

2.21

.024

.951

.944

1.071

Unidimensional

686.142

248

2.77

.031

.919

.910

1.257

Second order

515.584

244

2.11

.024

.950

.943

1.080

Bifactor

1152.571

225

5.12

.047

.828

.789

1.699

  1. Correlations are allowed between the following items: An1_k6 WITH An1_s4, In1_r3 WITH In3_r2, In2_s3 WITH Pl2_k4, and Pl2_s2 WITH Ka2_k3
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