R Graphical Manual

Last data update: 2014.03.03

R: Find value with largest difference from the mean

outlier

R Documentation

Find value with largest difference from the mean

Finds value with largest difference between it and sample mean, which can be an outlier.

outlier(x, opposite = FALSE, logical = FALSE)

`x`	a data sample, vector in most cases. If argument is a dataframe, then outlier is calculated for each column by `sapply`. The same behavior is applied by `apply` when the matrix is given.
`opposite`	if set to TRUE, gives opposite value (if largest value has maximum difference from the mean, it gives smallest and vice versa)
`logical`	if set to TRUE, gives vector of logical values, and possible outlier position is marked by TRUE

A vector of value(s) with largest difference from the mean.

Lukasz Komsta, corrections by Markus Graube

set.seed(1234)
y=rnorm(100)
outlier(y)
outlier(y,opposite=TRUE)
dim(y) <- c(20,5)
outlier(y)
outlier(y,opposite=TRUE)