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Treatment Implementation and Statistical Power

A Research Note

Research Triangle Institute Research Triangle Park, North Carolina

W. Kenneth Poole

Research Triangle Institute Research Triangle Park, North Carolina

The authors contend that the assumption of equal treatment implementation in program evaluations is highly questionable. Through a reanalysis of data from afield evaluation of a nutrition supplementation program they demonstrate that including data on the level of treatment implementation in the analysis of treatment effects increases the power of the analysis. The results argue for the inclusion of data on treatment implementation as standard practice in future program evaluations.

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