Small learning communities, an initiative to transform large struggling comprehensive high schools into smaller autonomous schools, are being empirically examined in the field of education to assess if transformation is actually occurring as seen by positive outcomes, such as increased academic achievement. There is an absence of literature on…

The inherent methodological problem in conducting research at multiple sites is how to best derive an overall estimate of program impact across multiple sites, best being the estimate that minimizes the mean square error, that is, the square of the difference between the observed and true values. An empirical example illustrates the use of the…