hello,

Suppose you a monthly series you want to aggregate at a quaterly frequency
with the start and the end of your series in the middle of the quarter.
For example
 2001M2 2001M3 2001M4 2001M5 2001M6 2001M7
12                  13     12      14         16              15

how can you get something like :
2001Q1 2001Q2 200Q3
NA       14 NA

or
 2001Q1 2001Q2 200Q3
12.5 14 15

Thanks in advance

Matthieu

	[[alternative HTML version deleted]]


