When calculating info gain by hand, how do we deal with calculating the entropy for
data that has 0 yes or no values? If I enter a 0 when calculating the log2, I end up
with a math error on my calculator and then can't move forward in the calculations?
For example in the 2019 paper, there are 0 youth that buy computers, and 0 middle aged
not buying a computer. When I use this to calculate the entropy of these I get math
error. Is there something I've missed?