any help will be appreciated.
I use Oracle discoverer plus. recently I tried to build a running total (average) calculation using the template provided. I defined 10 previous observations for this purpose. discoverer performed the calculation but the problem is with the first 9 (in this case) observations of the new calculation, because it averaged the first observation, than the first two, than the first three and so on. when you get to the tenth observation it becomes correct, but you can imagine it is problematic, especially the graphic presentation. if I could present the graph only from the tenth observation and on it would be an acceptable compromise. any other suggestions are welcome too.

Thanks Alistair and Merry Christmas.
Unfortunatly it doesn't help. Oracle examples do not cover my specific need.