The one-parameter family of Box-Cox transformations
bctrans(y, lambda)A numeric, positive values assumed
The Box-Cox parameter
bctrans gives ((y^lambda)-1)/lambda for lambda not 0 or ln(y) for lambda equal to 0.
Internal function. No error checking done. It is assumed the entries of y are positive.
Box, GEP and Cox, DR (1964) An analysis of transformations (with discussion). Journal of the Royal Statistical Society B, 26, 211<U+2013>252.
Venables, WN and Ripley, BD (2002) Modern Applied Statistics with S. Fourth edition. Springer.
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