• Jesse Chandler, Mathematica Policy Research
  • Jonathan Robinson, Lander College
  • Leib Litman, Lander College
Longitudinal studies require retaining participants across data collection waves, adding uncertainty to study design. We use meta-analysis to estimate retention rates and identify practices that can increase retention rates substantially. We incorporate these findings into a tool that can estimate the most cost-effective means of achieving a desired T2 sample size.