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Calculating Power


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What is power? What influences power? How do you use power calculations to determine the appropriate sample size for your evaluation? What if the subjects are in different schools, districts, or states? What is realistic to do with a limited budget? These kinds of questions must be considered when designing evaluations. This session will cover the basics of calculating power for simple and complex designs, aligning unit of analysis and unit of alignment, and cost effectively allocating resources. Evaluation design examples and open access software packages will also be discussed.