“relevel” factors when using them to create dummy variables

June 28, 2007
By

(This article was first published on V. » R, and kindly contributed to R-bloggers)

?relevel

: The levels of a factor are re-ordered so that the level specified
by ‘ref’ is first and the others are moved down. This is useful
for ‘contr.treatment’ contrasts which take the first level as the
reference.

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