This report examines treatment group members in randomized experiments who may choose not to participate in program services despite being offered access to these services. In this paper, a comparison of alternative computations of the standard error of the treatment-on-the-treated (TOT) impact is conducted using three approaches (the Bloom correction, Instrumental Variables (IV), and the bootstrap, all of which are understood as "truth" from simulations) and both simulated data (where the “true” standard error is known) and real-world data from the GJ-HC Impact Evaluation.

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The Green Jobs and Health Care Impact Evaluation: Findings from the Implementation Study of Four Training Programs for Unemployed and Disadvantaged Workers

The Green Jobs and Health Care Impact Evaluation: Findings from the Impact Study of Four Training Programs for Unemployed and Disadvantaged Workers