oneway: Nonparametric group comparisons

In yunxileo/npar: Nonparametric group comparisons

Description

oneway computes nonparametric group comparisons, including an omnibus test and post-hoc pairwise group comparisons.

Usage

oneway(formula, data, exact = FALSE, sort = TRUE, method = c("holm",
  "hochberg", "hommel", "bonferroni", "BH", "BY", "fdr", "none"))

Arguments

formula	an object of class formula, relating the dependent variable to the grouping variable.
data	a data frame containing the variables in the model.
exact	logical. If TRUE, calculate exact Wilcoxon tests.
sort	logical. If TRUE, sort groups by median dependent variable values.
method	method for correcting p-values for multiple comparisons.

Details

This function computes an omnibus Kruskal-Wallis test that the groups are equal, followed by all pairwise comparisons using Wilcoxon Rank Sum tests. Exact Wilcoxon tests can be requested if there are no ties on the dependent variable. The p-values are adjusted for mulitple comparisons using the p.adjust function.

Value

a list with 7 elements:

CALL	function call
data	data frame containing the depending and grouping variable
sumstats	data frame with descriptive statistics by group
kw	results of the Kruskal-Wallis test
method	method used to adjust p-values
wmc	data frame containing the multiple comparisons
vnames	variable names

Author(s)

Rob Kabacoff <[e-mail]>

Examples

results <- oneway(hlef ~ region, life)
summary(results)
plot(results, col="lightblue", main="Multiple Comparisons",
     xlab="US Region", ylab="Healthy Life Expectancy at Age 65")

yunxileo/npar documentation built on May 4, 2019, 7:44 p.m.