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dt = Open( "$SAMPLE_DATA/Car Poll.jmp" );
obj = Partition(
	Y( :country ),
	X( :sex, :marital status, :age, :type, :size ),
	Method( "Decision Tree" ),
	Initial Splits( :size == {"Large"}, {}, {:size == {"Medium"}} )
);
The condition is for the left side and is either [name compareoperator value] or [name == list of values]. The left is an empty list if the right has splits. Omit the right side if there are no splits. The left and right continue recursively in this format.

Help created on 3/19/2020