Using AllPrevious with exception of first value
I am trying to sum values with the exception of the very first value. Is there a way to do this? I currently have this which includes the first value.
[Hits per code (count)] THEN Sum(([Value] / Avg([Value])) - 1) OVER (AllPrevious([Axis.X])) as [INL]
How can I perfor the equation on n=1:n-1?