Hi there
the simple formula is this:
quantify the moving average (5,13) of a currency against all the other currencies moving average (5,13)
the rate of change or rate of change strength is corrected from the moving average numbers , IE 5,13
so make it 3,5 also it is very sensitive , 14,29 also it is a lot less painful to change.
So depending on your trading style , IE higher or lower time frames , you adjust the moving average (x,x) to package.