Hi all,
I simply want to use Box-Cox to transform a single variable. However, most of the code I've seen requires 2 variables (dependent & independent) and does not save the transformed variable. The "Univariate Box-Cox" seems most relevant, but I can't understand how to run it. This is the SAS example below:
title 'Univariate Box-Cox';
data x;
call streaminit(17);
z = 0;
do i = 1 to 500;
y = rand('lognormal');
output;
end;
run;
proc transreg maxiter=0 nozeroconstant;
model BoxCox(y) = identity(z);
output;
run;
proc univariate noprint;
histogram y ty;
run;
I know that "x" is going to be my dataset and "z" is the constant (0), but I can't figure out exactly what to do with the variable I want transformed (y). I don't understand how putting the variable I want transformed in the "y" place in the "y = rand('lognormal')" code works. My original (y) variable values are just going to be overwritten by the = rand('lognormal'). I ran the code below and got values that are exactly the same as if I just made up a variable in the "y = rand('lognormal') portion.
Data newdataset;
set olddataset;
call streaminit(17);
z = 0;
do i = 1 to 500;
myvariable = rand('lognormal');
output;
end;
run;
proc transreg Data = newdataset maxiter=0 nozeroconstant;
model BoxCox(myvariable) = identity(z);
output;
run;
I would greatly appreciate any guidance!
Best,
Joe
