I am interested in running a partial least squares analysis using PROC PLS in SAS 9.4. I understand that, by default, the predictors and response variables in PLS are centered to a mean 0 and scaled to a standard deviation of 1. I have read that the PLS procedure can accommodate categorical predictors, and their is a CLASS statement available in PROC PLS.
My question is how the categorical predictors are handled in this procedure. Are they also centered and scaled by default? Is that appropriate or do I need to ensure they are not centered and scaled. Thanks!