The Proportion Test computes a test statistic to determine if a specific category in a sample has a different proportion than the expected proportion, p0. The node calculates the sample proportion of the category p̂. With the given null-hypothesized proportion p0, a z-Score is calculated via (p̂ - p0)/se, where se is the standard error. If the corresponding p-Value is below the given significance level α, the null hypothesis can be rejected. Missing values will be ignored. See Wikipedia on test statistic, "One-proportion z-test" for further information.
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