There isn't today a way to do what you are asking. I will log a feature request.
If the number of possible keys you are looking for is bounded, you could do something like this today;
And the same for B, and then the answer;
08-30-2017 05:42 AM - edited 08-30-2017 05:42 AM
+ 1 for this feature request.
I am trying to do a kind of scoring. e.g attraction to a specific country, therefor i use a tally. (Germany Site visited --> Germany +10)
Now i want to get a normalized Score. Tally Value divided by change count.