pairwise.t.test {ctest}

R Documentation

Pairwise t tests

Description

Calculate pairwise comparisons between group levels with corrections for multiple testing

Usage

pairwise.t.test(x, g, p.adjust.method=p.adjust.methods, pool.sd=TRUE, ...)

Arguments

x	Response vector
g	Grouping vector or factor
p.adjust.method	Method for adjusting p values (see p.adjust)
pool.sd	Switch to allow/disallow the use of a pooled SD
...	Additional arguments to pass to t.test

Value

Object of class "pairwise.htest"

See Also

t.test, p.adjust

Examples

data(airquality)
attach(airquality)
Month <- factor(Month, labels = month.abb[5:9])
pairwise.t.test(Ozone, Month)
pairwise.t.test(Ozone, Month, p.adj = "bonf")
pairwise.t.test(Ozone, Month, pool.sd = FALSE)
detach()