stratasphere: Stratified Spherical Approximate Conditional Modeling
For data where the observations occur or are collected in
a stratified fashion, the strata level effect is sometimes not
of interest or is simply impossible to estimate. Conditioning
on the strata eliminates these difficulties, but leads to a
combinatorially complex calculation. The spherical approximate
method replaces this complex calculation with a closed form
solution, leading to a simple fixed point iteration method for
fitting the linear model. This package implements linear model
fitting via Stratasphere(), and stepwise regression and
boosting extensions via StratasphereStep() and
StratasphereBoost(), respectively. Note that this package is
distributed under the Apache 2.0 license.
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