The main goal of this study was to illustrate and provide some direction for dealing with the complexities of propensity score matching within different multilevel contexts. Special attention is given to how procedures typically applied in a non-hierarchical setting may be modified to properly reduce the expected bias in the estimated treatment…

The document presents the final report of the High/Scope Demonstration Preschool Project, one of the First Chance national demonstration projects funded under the Handicapped Children's Early Education Program. Chapter 1 outlines accomplishments of the project in terms of seven program goals (including the development of procedures for assessing…