This function is very similar to the
scale function in that it centers
and scales data, but scaling is accomplished by dividing the centered data by two standard
deviations rather than one as detailed in Gelman (2008).
A vector to be scaled.
Gelman, A. (2008). Scaling regression inputs by dividing by two standard deviations. Statistics in Medicine, 27(15), 2865–2873. https://doi.org/10.1002/sim.3107
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