Description Usage Arguments Value
Evaluates qoted variables by group in a data frame. Based
on eval.quoted
.
1 2 |
exprs |
a list of expressions |
data |
a data frame |
by |
a vector of character strings that specify variable names in data. data will be split into groups based on the unique combinations of the values of these variables within the data frame. exprs will be evaluated separately for each group. |
enclos |
an environment |
a data frame formed by combining the results of evaluating exprs in each group of data
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