Function to center and/or scale the coloumns of a matrix in various ways. The coloumns can be centered with their means or with supplied values, and they can be scaled with their standard deviations or with supplied values.
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A logical, or a numeric vector. The values to subtract from
each column. If
A lgical, or a numeric vector. The values to divide each
column with. If
A logical. If
stdize standardizes the coloumns of a matrix by subtracting their
means (or the supplied values) and dividing by their standard deviations (or
the supplied values).
TRUE, division-by-zero is guarded
against by substituting any 0 in
center (either calculated or
supplied) with 1 prior to division.
The main difference between
scale is that
stdize divides by the standard deviations even when
stdize3 is a variant with a three-element list as output (
x, center, scale) and where
is also used to avoid centring (constant term in model matrix is unchanged).
Bj<c3><b8>rn-Helge Mevik and <c3><98>yvind Langsrud
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