A RapidMiner user wants to know the answer to this question: "I have a list of about 120 values that serve as categories. I have to be able to predict what category a value belongs to based on it's other attribute. The values that I am training on are associated with one of these items. I need to create a model that will categorize the combination of values from other columns and predict what category it belongs in. I have tried to use a decision tree and it does not seem to be doing very well. There are too many categories and it keeps making poor predictions. Any suggestions? Thank you."