Description Usage Arguments Value Methods (by class)
Pick out best levels of a given X variable at which to view effects.
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x |
a column from a population. |
a tall data.frame with columns level
and value
.
factor
: return all levels of the factor
logical
: return FALSE and TRUE
character
: return all unique elements, sorted
integer
: return all unique elements, sorted
numeric
: return the levels in the data and a one-unit increase
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