Table 6.
Examination of measurement invariance between Grades 3 and 7.
| df | χ² | CFI | TLI | RMSEA (90% CI) | SRMR | Δdf | Δχ² | ||
|---|---|---|---|---|---|---|---|---|---|
| Sample A | |||||||||
| Model 1 | Baseline model | 54 | 95.15*** | .97 | .94 | .07 (.04–.09) | .04 | ||
| Model 2 (compared to Model 1) | Model with equal loadings | 59 | 17.33*** | .90 | .85 | .11 (.09–.12) | .09 | 5 | 71.05*** |
| Model 3 (compared to Model 1) | Model with equal loadings except MLT and NDW | 57 | 101.06*** | .96 | .94 | .07 (.04–.09) | .05 | 3 | 5.92 |
| Model 4 (compared to Model 3) | Model 3 + equal intercepts | 60 | 114.18*** | .95 | .93 | .07 (.05–.09) | .08 | 3 | 11.48** |
| Model 5 (compared to Model 3) | Model 3 + equal intercepts on MLT, NDW, and SENTENCE | 59 | 102.21*** | .96 | .95 | .06 (.04–.08) | .06 | 2 | 1.47 |
| Sample B | |||||||||
| Model 1 | Baseline model | 53 | 109.78*** | .96 | .92 | .08 (.05–.10) | .06 | ||
| Model 2 (compared to Model 1) | Model with equal loadings | 58 | 115.28*** | .95 | .93 | .08 (.06–.10) | .07 | 5 | 6.21 |
| Model 3 (compared to Model 2) | Model 2 + equal intercepts | 63 | 175.17*** | .91 | .87 | .10 (.08–.12) | .08 | 5 | 52.06*** |
| Model 4 (compared to Model 2) | Model 2 + equal intercepts except ORDER and TNW | 61 | 12.11*** | .95 | .93 | .08 (.06–.10) | .07 | 3 | 4.84 |
CFI Comparative Fit Index, TLI Tucker Lewis coefficient, RMSEA root mean square error of approximation, SRMR standardized root mean squared residual, TNW total number of words, MLT mean length of T-units, NDW number of different words, ORDER logical ordering of idea, SENTENCE sentence copying fluency
*
p < .05;
**
p < .01;
***
p < .001