Table 2.
Change statistics and model fit analyses for each step in the hierarchical linear regressions using CCT and MCDI vocabulary as the dependent variable (DV), respectively.
| Change statistics |
Model fit |
|||||
|---|---|---|---|---|---|---|
| R 2Δ | p | β | F | R | p | |
| DV: CCT relative vocabulary size | ||||||
| 1. Maternal education | .12 | |||||
| Age | .01 | .52 | .01 | 0.66 | .12 | .52 |
| 2. Language | .002 | .63 | .05 | 0.51 | .13 | .67 |
| 3. Overall parent estimate of relative exposure | < .001 | .97 | .004 | 0.38 | .13 | .82 |
| 4. LEAT calculation of relative exposure | .06 | .02* | .24 | 1.42 | .27 | .22 |
| DV: MCDI relative vocabulary size | ||||||
| 1. Maternal education | .14 | |||||
| Age | .03 | .23 | .12 | 1.50 | .17 | .23 |
| 2. Language | .03 | .08 | .18 | 2.04 | .25 | .11 |
| 3. Overall parent estimate of relative exposure | .002 | .64 | .05 | 1.57 | .25 | .19 |
| 4. LEAT calculation of relative exposure | .07 | .008* | .27 | 2.81 | .36 | .02* |
Note. CCT = Computerized Comprehension Task; LEAT = Language Exposure Assessment Tool; MCDI = MacArthur Communicative Development Inventory.
*
Indicates significant value at p < .05.