Bradley, R. H., & Gilkey, B. (2002). The impact of the Home Instructional Program for Preschool Youngsters (HIPPY) on school performance in 3rd and 6th grades. Early Education and Development, 13(3), 301–311.
Study design characteristics contributing to rating
| Design | Attrition | Baseline equivalence | Confounding factors? | Valid, reliable measures? |
|---|---|---|---|---|
| Non-experimental comparison group design | Not Applicable |
Not established on SES or outcomes. |
None |
Not assessed in manuscripts reviewed under Handbook of Procedures and Standards, Version 1 |