How to calculate the difference between two numbers to create new measure
I'm trying to calculate a value which I believe should be a measure but am not sure how to do it. I have a set of data points for a list of brands and I want to create a new value which calcuates the difference between two of the values.
The data is structured as follows
Brand 1 - Aware - 60%
Brand 1 - Familiar - 20%
Brand 1 - Would recommend - 15%
Brand 2 - Aware - 45%
Brand 2 - Familiar - 13%
Brand 2 - Would recommend - 3%
Familiar is a subset of those Aware and I would like to create a a measure that is 'Aware but not Familiar' - e.g. For Brand 1 it would be 60%-40% = 20%. Is that possible?