# fpTrans: Transform formula variables

## 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

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