Description Usage Arguments Value

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.

1 |

`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. |

the transformed vector

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