Table 17.
Cluster‐robust meta‐regression for effect size calculation method for nonacademic effect sizes.
| Effect (n of effect sizes) | Hedges’ g | 95% CI of g | df | p |
|---|---|---|---|---|
| Other methoda (3) | 0.78 | (−1.95, 3.51) | 1.00 | 0.171 |
| Standardized mean raw score change (46) | −0.45 | (−2.36, 1.45) | 1.28 | 0.273 |
| Standardized mean difference (42) | −0.54 | (−2.11, 1.04) | 1.37 | 0.197 |
Note: N of studies = 18, N of effect sizes = 91, assumed ρ = 0.8, I 2 = 83.46. Cluster‐robust estimates with df < 4.00 should be interpreted with caution (Tanner‐Smith, Tipton, & Polanin, 2016). Wald test for null difference between standardized mean raw score change and standardized mean difference effect size approaches, F(2, 1.9) = 2.12, p = 0.337. Positive effect sizes favor Montessori over traditional education.
Abbreviation: CI, confidence interval.
a
Reference category/intercept.