Converting nominal to numeric
I am very new to RapidMinder, and I need to convert a lot of nominal attributes to numeric. I tried Nominal2Numerical in operator in RapidMiner 4.4 hoping it would do dichotomization - but it does not, instead it seems to be doing the conversion to equidistant real numbers which does not seem to make much sense, at least in my case.
Eventually, I figured out how to do dichotomization "manually" by using ConditionedFeatureGeneration, but it gets tedious since I have to create an separate operator for each value of each attribute, and there're many.
For nominals with many possible values, I figured out how to convert them to target frequencies using ValueIterator and macros, but again it seems like I might be missing a much simpler solution.
I will appreaciate any advice!
Thanks,
~Alexei
Eventually, I figured out how to do dichotomization "manually" by using ConditionedFeatureGeneration, but it gets tedious since I have to create an separate operator for each value of each attribute, and there're many.
For nominals with many possible values, I figured out how to convert them to target frequencies using ValueIterator and macros, but again it seems like I might be missing a much simpler solution.
I will appreaciate any advice!
Thanks,
~Alexei