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Power Analysis for Geographic Representativeness

In many disciplines, researchers attempt to make global inferences from a sample of local case studies. In those cases, especially where the sample size is small, it is necessary to demonstrate that the sample is unbiased, a property we call “representativeness”. Most statistical tests are designed to detect bias, not the lack of it, and it is an error to simply accept the null hypothesis when a statistical test fails to reject it. The GLOBE system helps researchers demonstrate representativeness by augmenting traditional statistical tests (such as X2) with power analysis.