from package dplyr, except that they work only on a subset
.data, this subset being defined by the
standard evaluation versions, similar to
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A tbl or data.frame.
A condition defining the subset on which the mutate
or transmute operation applies.
New variables are initialized to
Name-value pairs of expressions. Use
Used to work around non-standard evaluation.
A tbl or a data frame, depending on the class of
Adapted from G. Grothendieck on StackOverflow, see http://stackoverflow.com/a/34096575.
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