Hello
I have monthly price data in the follwing form
p801 p802............p036
good1 100 100.3...........
good2 100 100.5...........
.
.
goodn 100 100.6..........
p801 denotes price at january 1980
I want to construct a geometric mean of monthly prices for
each possible year
say price index for year going from january 80 to december 80
and feb 80 to january 81
.... to may 2002 to june 2003
any help
AbdelRahmen
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