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decision tree query
I am new to rapidminer & I want to learn the usage of decision tree operator. In decision tree is it possible to get our own approach rather than getting a big tree. Example if there are 3 columns in a table X column with records(x1,x2,x3,......xn) ; Y(y1,y2,y3,.....yn) & Z(z1,z2,z3)
In decision tree analysis I am getting all the combinations of x,y,z. But, what if I want to get a specific combination and probability like what is the probability of getting z1 when x1 works with y1 or z2 when x1 works with y3 and so on. and also, how to generate probabilities. I am a learner so please guide me to get the required output.