boxcoxFun {qAnalyst} | R Documentation |
Function to obtain Box Cox transformations
Description
boxcoxFun
performs box cox transformation, finding optimal lambda for the given data vector. boxcoxFun
returns a transformation class object.
Usage
boxcoxFun(x)
Arguments
x |
numeric data vector |
Details
boxcoxFun
calls internally powerTransform
and bcPower1
functions from package car to build output transformation object.
Value
A transformation class object is returned. A transformation class objects consists in a list composed by the following items:
type |
type of transformation, in such case: "boxcox" |
parameters |
parameter lambda is stored in this item |
original |
original data vector |
parameters |
trasformed data vector |
Note
Box cox transformations requires data to be positive. X vector positivity is internally checked before performing transformation.
Author(s)
Giorgio Spedicato, Nicola Sturaro Sommacal
References
Venables, Ripley Modern Applied Statistics with S-PLUS
See Also
print.transformation
, plot.transformation
, johnsonFun
Examples
#warpTiles example
data(warpTiles)
boxInfo=boxcoxFun(x=warpTiles$warping)
print(boxInfo)