| Box One Text: | All FY1998-1999 Head Start Grantee/Delegate Agencies in All 50 States, DC, & Puerto Rico Exclude “very new,” migrant, Tribal Organization, and Early Head Start only grantee/delegate agencies (N=1,715). |
| Box Two Text: | Create Geographic Grantee Clusters and Group into 25 Strata Group grantee/delegate agencies by geographic proximity with a minimum of 8 per cluster (N=161 clusters). Stratify clusters on: state pre-K and childcare policy; child race/ethnicity, urban/rural location, and region. Select 1 cluster per stratum with probability proportional to Head Start enrollment (N=261 grantee/delegate agencies). |
| Box Three Text: | Determine Eligible Grantee/Delegate Agencies in Each Cluster Exclude closed or merged programs and those that are “saturated” (i.e., have very few unserved children in the community). Eliminated 38 grantee/delegate agencies (N=223). Small grantee/delegate agencies were then grouped to ensure meeting target sample sizes (N=184 groups). |
| Box Four Text: | Stratify and Select Grantee/Delegate Agencies Stratify on grantee/delegate agency characteristics and local contextual variables, and randomly select approximately 3 grantee/delegate agencies per cluster (N=76 grantee groups, 90 grantee/delegate agencies across 23 states). |
| Box Five Text: | Recruit Grantee/Delegate Agencies for the Study Resulted in 76 grantee/delegate agency groups and 87 individual grantee/delegate agencies. |
| Box Six Text: | Develop List of Head Start Centers Participating grantee/delegate agencies provided lists of operating centers as of fall 2002 (N=1,427 centers). |
| Box Seven Text: | Determine Eligible Centers and Create Center Groups Exclude saturated centers and create center groups by combining small centers with nearby centers (N=1,258 centers). |
| Box Eight Text: | Stratify and Select Sample of Centers Stratify centers using same characteristics used with grantees. Randomly select centers and exclude saturated centers (84 grantee/delegate agencies, 383 centers). |
| Box Nine Text: | Select Children and Conduct Random Assignment Final Sample: 84 grantee/delegate agencies, 378 centers, 2,783 Head Start children and 1,884 non-Head Start children. |
| Study Name | ECERS Mean | SD | SD*2 | SD*1.5 |
|---|---|---|---|---|
| Head Start Impact Study - Head Start Classrooms (Spring 2003) | 5.22 | 0.89 | 1.8 | 1.34 |
| Head Start FACES Classrooms (Spring 2001) | 4.91 | 1.00 | 2.0 | 1.50 |
| Georgia Pre-K Study - 27 Head Start Classrooms (Henry et al, 2003) | 4.50 | 0.85 | 1.7 | 1.3 |
| Head Start Impact Study - Non-Head Start Classrooms (Spring 2003) | 4.52 | 1.11 | 2.2 | 1.7 |
| Georgia Pre-K Study - 69 State Pre-K Classrooms (Henry et al, 2003) | 4.70 | 0.67 | 1.3 | 1.0 |
| Georgia Pre-K Study - 30 Private Pre-K Classrooms (Henry et al, 2003) | 3.50 | 0.98 | 2.0 | 1.5 |
| 246 Community- & School-based Centers in New Jersey (Resnick, 2001) | 4.62 | 1.13 | 2.3 | 1.7 |
| NCEDL 6-State Pre-K Study (Bryant, et al, 2004) | 3.90 | 0.77 | 1.5 | 1.2 |