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To improve the generalizability of impact evaluations, recent research hasexamined statistical methods for selecting representative samples of sites.However, these methods rely on having rich data on impact moderators for allsites in the target population. This paper offers a new approach to selectingsites for impact studies when rich data on impact moderators are available, butonly from a survey based on a representative sample of the impact study'starget population. Survey data are used to (1) estimate the proportion of sitesin the population with certain characteristics, and (2) set limits on thenumber of sites with different characteristics that the sample can include. ThePrincipal Investigator enforces the limits to ensure that certain types ofsites are not overrepresented in the final sample. These limits can be layeredon top of site selection and recruitment approaches to improve therepresentativeness of the sample.

Using Survey Data to Obtain More Representative Site Samples for Impact Studies