using {admisc} | R Documentation |
A function almost identical to the base function with()
, but allowing
to evaluate the expression in every subset of a split file.
using(data, expr, split.by = NULL, ...)
data |
A data frame. |
expr |
Expression to evaluate |
split.by |
A factor variable from the |
... |
Other internal arguments. |
A list of results, or a matrix if each separate result is a vector.
Adrian Dusa
set.seed(123) DF <- data.frame( Area = factor(sample(c("Rural", "Urban"), 123, replace = TRUE)), Gender = factor(sample(c("Female", "Male"), 123, replace = TRUE)), Age = sample(18:90, 123, replace = TRUE), Children = sample(0:5, 123, replace = TRUE) ) # table of frequencies for Gender table(DF$Gender) # same with using(DF, table(Gender)) # same, but split by Area using(DF, table(Gender), split.by = Area) # calculate the mean age by gender using(DF, mean(Age), split.by = Gender) # same, but select cases from the urban area using(subset(DF, Area == "Urban"), mean(Age), split.by = Gender) # mean age by gender and area using(DF, mean(Age), split.by = Area & Gender) # same with using(DF, mean(Age), split.by = c(Area, Gender)) # average number of children by Area using(DF, mean(Children), split.by = Area) # frequency tables by Area using(DF, table(Children), split.by = Area)