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How to aggregate attribute values by percentage
I have a data set that I need to transform from nominal to binominal for posterior mining. However, In order to reduce the number of columns after the transformation, I want to get each attribute and check the total occurrence of each of it's values for all my examples (same thing that rapidminer does in the results -> statistics tab). So that I could get all the values below a certain threshold and aggregate them as a single value called "other_values".
I tried to figure this out using the loop attribute and loop value operators but I could not find a solution, anyone did something like this before or has any idea on how this can be acomplished?