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krasnobaev/basics

Created October 17, 2014 22:32
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R handies
Raw
basics
data[47]
table(is.na(data))
mean(data, na.rm=TRUE)
mean(data.R[which(data > 31 & data > 90)])
mean(data[data == 6])
max(data[data == 5], na.rm=TRUE)
by(iris$Sepal.Length, iris$Species == "virginica", mean)[2]
apply(iris[, 1:4], 2, mean)
with(mtcars, tapply(mpg, cyl, mean))
tapply(mtcars$mpg, mtcars$cyl, mean)
by(mtcars, mtcars, mean)
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