Table 2.
Model results for pre-post main outcomes.
| Effect | Knowledge | Teaching writing | Supporting writing | Efficacy | ||||
|---|---|---|---|---|---|---|---|---|
| Fixed | Est. | SE | Est. | SE | Est. | SE | Est. | SE |
| Intercept | 0.11 | 0.07 | 3.89 | 0.21 | 4.21 | 0.17 | 4.21 | 0.11 |
| Pretest | 0.29 | 0.12 | 0.25 | 0.14 | 0.45 | 0.14 | 0.52 | 0.11 |
| SIWI | 3.69* | 0.10 | 1.27* | 0.30 | 0.90* | 0.24 | 0.59* | 0.15 |
| Random | Var. | SD | Var. | SD | Var. | SD | Var. | SD |
| Residual | 0.12 | 0.35 | 1.01 | 1.00 | 0.68 | 0.82 | 0.26 | 0.51 |
| Effect Size | 10.48 | 1.26 | 1.08 | 1.15 | ||||
Est., estimate; Var, variance; SE, standard error. *p < 0.05 for fixed effects. Effect sizes are Hedges g: the treatment effect divided by the residual SD (Hedges, 2007).