    Statistical Help
Home >

# Categorical Outcomes

 Groups Purpose Conditions or Assumptions Test Descriptive Measures (also used to calculate CIs) Single sample Compare proportion to historical or hypothetical (known) proportion N > 30 One-sample z-test (exact binomial N < 30) Proportion, difference from historical proportion Compare proportion to historical or hypothetical (known) proportion Exact binomial test (one-sample) Proportion, difference from historical proportion Compare proportion(s) to hypothetical (known) proportion(s) Allows overall comparison of > 2 categories Pearson's goodness-of-fit Chi-square Proportion(s) relative to historical proportion(s) Two independent samples Compare proportions (absolute difference) N large (> 30) Normal approximation to binomial Difference between two proportions Compare proportions (absolute difference) Exact binomial test (two samples) Difference between two proportions Two+ independent samples Compare proportions or test for association Expected cell count > 1; most > 5 Chi-square test Odds ratio, row and column percentages, Compare proportions and test for association Use for empty cells or small cell counts Fisher's exact test Odds ratio, row and column percentages, Compare rates and test for association Population denominators available (able to calculate valid rates) Chi-square or Fisher's exact test Relative risk, row and column percentages Matched Pairs (2) Compare proportions or test for association McNemar's test Difference between two proportions (different std dev than unmatched) Matched Sets (> 2) Compare proportions or test for association Cochrane Q test Difference between pairs of proportions

rev. 05-Aug-2019     