Calculate pairwise comparisons between group levels with corrections for multiple testing
pairwise.t.test(x, g, p.adjust.method = p.adjust.methods, pool.sd = !paired, paired = FALSE, alternative = c("two.sided", "less", "greater"), …)
grouping vector or factor.
Method for adjusting p values (see
switch to allow/disallow the use of a pooled SD
a logical indicating whether you want paired t-tests.
a character string specifying the alternative
hypothesis, must be one of
"less". Can be abbreviated.
additional arguments to pass to
Object of class
pool.sd switch calculates a common SD for all
groups and uses that for all comparisons (this can be useful if some
groups are small). This method does not actually call
so extra arguments are ignored. Pooling does not generalize to paired tests
paired cannot both be
Only the lower triangle of the matrix of possible comparisons is being
calculated, so setting
alternative to anything other than
"two.sided" requires that the levels of
g are ordered