Methods that apply a function across a levels of one or more factors
Methods that apply a function across a levels of one or more factors. It works like aggregate but returns a table instead. It also has a useNA options that adds NA as a level before applying the function.
xf(formula, data, FUN, ..., subset, na.action = na.omit, useNA = FALSE, addmargins = TRUE)
formula |
Formula defining the variables. On the left is the variable we are applying the function to, on the right, variables defining levels of the tables |
data |
Data.frame containing the variables |
FUN |
The function to apply to each subset of data |
... |
extra parameters to FUN |
subset |
Vectors defining a subset of data.frame
(see |
na.action |
Action functions to deal with NA in data file |
useNA |
Make NA a level of the factors (if any) |
addmargins |
Add function applied to the margins of each category |
xf returns an object "xf" that behaves like a table with all associated methods.
Charles-Édouard Giguère
res <- xf(Sepal.Length~Species,iris,mean) barplot(res)
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