Hi,
Firstly, apologies as I have posted this on community.rstudio.com too.
I want to optimise a Box-Cox transformation on columns of a matrix (ie, a
unique lambda for each column). So I wrote a function that includes the call to
MASS::boxcox in order that it can be applied to each column easily. Except that
I'm getting an error when calling the function. If I just extract a column of
the matrix and run the code not in the function, it works. If I call the
function either with an extracted column (ie dd1 in the reprex below) or in a
call to apply I get an error (see the reprex below).
I'm sure I'm doing something silly, but I can't see what it is. Any help
appreciated.
library(MASS)
# Find optimised Lambda for Boc-Cox transformation
BoxCoxLambda <- function(z){
b <- boxcox(lm(z+1 ~ 1), lambda = seq(-5, 5, length.out = 61), plotit =
FALSE)
b$x[which.max(b$y)] # best lambda
}
mrow <- 500
mcol <- 2
set.seed(12345)
dd <- matrix(rgamma(mrow*mcol, shape = 2, scale = 5), nrow = mrow, ncol = mcol)
# Try it not using the BoxCoxLambda function:
dd1 <- dd[,1] # 1st column of dd
bb <- boxcox(lm(dd1+1 ~ 1), lambda = seq(-5, 5, length.out = 101), plotit =
FALSE)
print(paste0("1st column's lambda is ", bb$x[which.max(bb$y)]))
#> [1] "1st column's lambda is 0.2"
# Calculate lambda for each column of dd
lambdas <- apply(dd, 2, BoxCoxLambda, simplify = TRUE)
#> Error in eval(predvars, data, env): object 'z' not found
Created on 2023-07-08 with reprex v2.0.2
Thanks for your time and help.
Ron
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