fpTrans: Transform formula variables

In glmBfp: Bayesian Fractional Polynomials for GLMs

Description

Simple function to apply the Box Tidwell transformation to a variables in a formula. Variable is first shifted and scaled NewVar = (Var+shift)/scale then transformed and optionally centered. Can be used in formulas as poly() is.

Usage

fpTrans(var, powers = 1, scale = 1, shift = 0, center = TRUE)

Arguments

var	the variable to transform
powers	one or more powers
scale	value to scale the variable after shifting (default=1)
shift	value to shift the variable by (default=0)
center	center the variable when tranforming.

Value

the transformed vector

glmBfp documentation built on July 2, 2020, 2:30 a.m.