Contrasts | R Documentation |
Generate all pairwise contrasts for using in a post-hoc test, e.g. ScheffeTest.
Contrasts(levs)
levs |
the levels to be used |
A matrix with all possible pairwise contrasts, that can be built with the given levels.
Andri Signorell <andri@signorell.net>
ScheffeTest
Contrasts(LETTERS[1:5])
# B-A C-A D-A E-A C-B D-B E-B D-C E-C E-D
# A -1 -1 -1 -1 0 0 0 0 0 0
# B 1 0 0 0 -1 -1 -1 0 0 0
# C 0 1 0 0 1 0 0 -1 -1 0
# D 0 0 1 0 0 1 0 1 0 -1
# E 0 0 0 1 0 0 1 0 1 1
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