Evaluation FAQ: What Sample Size Do I Need for an Impact Evaluation?


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Author(s): MEASURE Evaluation

Year: 2015

Evaluation FAQ: What Sample Size Do I Need for an Impact Evaluation? Abstract:

An appropriate study sample size and method of selection is critical to the success of any evaluation. In an impact evaluation, with a comparison drawn between a treatment group and a comparison group or showing a change over time, the following factors should be considered during the design phase. This will ensure that an adequate sample is selected to answer your primary evaluation questions.

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