Approaches to Evaluating Welfare Reform: Lessons from Five State Demonstrations. 1. Issues


Each evaluation must address several issues concerning what is an adequate sample size:

  • Goals of the sample design, particularly the key outcomes to be measured
  • Minimum precision standard for each goal
  • Balance of the sample between the experimental or demonstration group and the control or comparison group
  • Relative emphasis on overall impacts versus subgroup impacts
  • Implications for sample size of a nonexperimental versus an experimental design