Find value with largest difference from the mean

Description:

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

Usage:

[out] = outlier(x,opposite,logical)

Arguments:

x: a data sample, vector in most cases. If argument is a
matrix, each column is treated as independent dataset.

opposite: if set to 1 (default 0), gives opposite value (if largest value has
maximum difference from the mean, it gives smallest and vice
versa)

logical: if set to 1 (default 0), gives vector of logical values, and possible
outlier position is marked by 1, others are 0

Value:

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

Author(s):

Lukasz Komsta, ported from R package "outliers".
See R News, 6(2):10-13, May 2006