RDocumentation: pairwise.t.test
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    if(!require('stats')) {
    install.packages('stats')
    library('stats')
}
    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()