Computes the Box-Cox transform of the data for a given value of
lambda. Includes the scaling factor.
Usage
bct(y, lambda)
Arguments
y
Vector of data to be transformed.
lambda
Scalar exponent for transform (1 is linear, 0 is log).
Value
A vector of the same length as y with the corresponding transformed values.
Details
bct computes the Box-Cox family of transforms: y = (y\^lambda -
1)/(lambda*gm\^(lambda-1)), where gm is the geometric mean of the y's.
returns log(y)*gm when lambda equals 0.