## April 28, 2020

# An Alternative Approach to Power Calculations

The typical approach to power calculations goes something like this: first, the evaluator estimates the smallest MDE for which the intervention would be cost-effective. Second, the evaluator calculates the sample required to detect that MDE. Third, the evaluator throws out the calculations from step two after realizing the evaluation would be way too expensive and instead estimates the MDE she can detect given her budget constraints.
The problem with this approach is that it doesnâ€™t take into account the cost of the evaluation itself.
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