Calculating average for periods between years

Question

Hello,
I'm stuck with creating calc script to calculate period average. There are 12 periods (P1 to P12) and Years. For certain account member (AV Balance) I need to calculate the average of another account member (Balance) for current period and the previous one, so if account "Balance" is 100 for P1 and 200 for P2, account "AV Balance" for period P2 should be 150. That's easy. The problem is that if I need to calculate the average for period P1, the calculation must take P1 for current year and P12 for previous year, can you advice me on how to create the calc script?
What I have at the moment (I'm very new in calc scripts) is for each period (except P1 as it has to use P12 from prior year):
FIX (P2)
"AV Balance"=@SUMRANGE ("Balance","P1":"P2")/2;
ENDFIX
FIX (P12)
"AV Balance"=@SUMRANGE ("Balance","P11":"P12")/2;
ENDFIX
Kind regards
Marcin Stawny

Answer 1

My first question is are your periods in a dense dimension if so, your calculation will calculate every single block in the database. This might be better if .
you did it as a formula using currmbrrange
something like
IF(@ISMbr("Jan"))
Balance + @shift(Balance,-1,years);
else
@avgrange(skipmissing,Balance,@CURRMBRRANGE(Period, LEV, 0,-1,0));
endif
Note, I have not syntax checked this and I'm really bad at getting the correct number of parens, also you might want to put a second if statement wrapping this to only do it at level zero of periods. I would make this member dynamic and you might need to make it two pass