Quote Originally Posted by Subterranean View Post
I don't believe you can have negative correlation in this case. You could if you were comparing two linear variables such as weight and height, but not if you were asking if there was a correlation between two systems...in which case, it would go from a correlation of 0 to 100%.
What you call CORRELATION inhere is actually CORRESPONDENCE.
So, 1:1 positive correlation => 100% correspondence.
1:1 negative correlation => 0% correspondence.
No correlation => 50% correspondence.