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Statistical significance is a characteristic of a statistic viewed in light of a null hypothesis and a given significance level. It reflects whether the statistic belongs to the rejection region (is statistically significant) or the acceptance region (is not statistically significant).

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Is there a natural way to determine a threshold for required number of data points?

Often you want to compute a statistic, but only for entities that meet criteria for having a meaningful sample size. For instance, in baseball you often see a footnote like "among batters with at leas …
Joshua Frank's user avatar