Compare 2 or more percentages
Are percentages in each
category the same?
Nonparametric Approach. Contingency table
test (or Test of Proportions). See chapter 14.
Are percentages in ordered
categories (low, medium, high) the same?
Nonparametric Approach. Kruskal-Wallis
test. See chapters 5 and 14.
Are percentages in ordered
categories (below, above) related to ordered groups (low,
medium, high)?
Nonparametric Approach. Kendall's tau
correlation coefficient. See chapters 8 and 14.
Chapter references are to the course textbook Statistical Methods in Water
Resources.