What are the different methods available in the catTrans action?

The catTrans action provides several methods for transformation: 'DTREE' (groups based on a one-level decision tree), 'GROUPRARE' (groups rare levels of the variable, which is an unsupervised technique), 'ONEHOT' (performs one-hot encoding), 'RTREE' (groups based on a one-level regression tree), and 'WOE' (groups based on maximizing the information value, IV).