Basically if there are more values for the target attribute, then "C" reflects this in the entropy equation ( 1st equation on this page ). I have changed it to show this. The number of bits to encode increases yes, but it's still log to base 2.
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re: This probability measures
Basically if there are more values for the target attribute, then "C" reflects this in the entropy equation ( 1st equation on this page ). I have changed it to show this. The number of bits to encode increases yes, but it's still log to base 2.