Nonparametric tests

• Sign test
• Wilcoxon signed-rank test

• Wilcoxon rank-sum (Mann–Whitney) test
• Equality of medians
• Kruskal–Wallis test
• Kolmogorov–Smirnov test
• Binomial probability test
• Chi-squared tests for association
• Tests for trend
• One- and two-sample tests of proportions
• Test for random order
• Equality of survivor functions
• Equality of ROC areas
• Equality of ROC area against a standard ROC curve

See New in Stata 11 for more about what was added in Stata Release 11.

Nonparametric correlation coefficients

• Spearman’s rank order
• Kendall’s rank order