An Instrumental Variable Approach for Head Start Attendance on Low Income Children

Purpose: This study examined (1) the causal impact of Head Start on children's comprehensive outcomes and (2) why families did not comply to the original assignment. Method: Based on the Head Start Impact Study data, children between the ages of 3 and 4 years (N = 3780) were examined for assignment, attendance, and causal impacts on outcomes. Results: Effect of instrumental variable analysis was greater than that of assignment and attendance for measured outcomes. Assignment to the Head Start, older child age (age 4 over age 3), urban residence, and higher family income were associated with non-compliance. Inclusion of care quality into the model illustrated important nuances in predicting families' compliance with Head Start versus control condition. Discussion: Head Start participation among low income children should be maintained for its positive causal effects on children. Quality of childcare as well as several child and family barriers to access to Head Start needs to be addressed to enhance Head Start enrollment.