Mean(vars Data, int Period)

would be useful in my opinion. I expected to find it here http://zorro-trader.com/manual/en/statistics.htm

I will use Sum() / Period instead. but you know about http://en.wikipedia.org/wiki/Loss_of_significance right

If you don't find something in the manual, trust the search function. The mean is also called "average", and in statistics it's the 1st moment.

Ah, thanks!