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Analyze categorical data

Confidence interval of a proportion or count.
Chi-square. Compare observed and expected frequencies.
Fisher's and chi-square. Analyze a 2x2 contingency table.
McNemar's test to analyze a matched case-control study.
Binomial and sign test. Compare observed and expected proportions.
NNT (Number Needed to Treat) with confidence interval.
Predictive values from sensitivity, specificity, and prevalence.
Kappa. Quantify interrater agreement.