mean after transformation but prior to standardization
sd
sd after transformation but prior to standardization
lambda
estimated lambda value for skew transformation
n
number of nonmissing observations
norm_stat
Pearson's P / degrees of freedom
standardize
Was the transformation standardized
The predict function returns the numeric value of the transformation
performed on new data, and allows for the inverse transformation as well.
Arguments
x
A vector to normalize with Yeo-Johnson
eps
A value to compare lambda against to see if it is equal to zero
standardize
If TRUE, the transformed values are also centered and
scaled, such that the transformation attempts a standard normal
...
Additional arguments that can be passed to the estimation of the
lambda parameter (lower, upper)
object
an object of class 'yeojohnson'
newdata
a vector of data to be (reverse) transformed
inverse
if TRUE, performs reverse transformation
Details
yeojohnson estimates the optimal value of lambda for the
Yeo-Johnson transformation. This transformation can be performed on new
data, and inverted, via the predict function.
The Yeo-Johnson is similar to the Box-Cox method, however it allows for the
transformation of nonpositive data as well. The step_YeoJohnson
function in the recipes package is another useful resource (see
references).
References
Yeo, I. K., & Johnson, R. A. (2000). A new family of power
transformations to improve normality or symmetry. Biometrika.
Max Kuhn and Hadley Wickham (2017). recipes: Preprocessing Tools to Create
Design Matrices. R package version 0.1.0.9000.
https://github.com/topepo/recipes