PREVGROUPVAL is a funtion used in custom summary formulas to return the value of a summary field from a previous grouping.
Example:
(AMOUNT:SUM +
PREVGROUPVAL(AMOUNT:SUM, CLOSE_DATE) +
PREVGROUPVAL(AMOUNT:SUM, CLOSE_DATE, 2) ) / 3 gives average closed Opportunities amount for 3 weeks.
AMOUNT:SUM - Gives current week sum.
PREVGROUPVAL(AMOUNT:SUM, CLOSE_DATE) - Gives previous week sum.
PREVGROUPVAL(AMOUNT:SUM, CLOSE_DATE, 2) - Gives 2 weeks before sum.
Cheers!!!
Example:
(AMOUNT:SUM +
PREVGROUPVAL(AMOUNT:SUM, CLOSE_DATE) +
PREVGROUPVAL(AMOUNT:SUM, CLOSE_DATE, 2) ) / 3 gives average closed Opportunities amount for 3 weeks.
AMOUNT:SUM - Gives current week sum.
PREVGROUPVAL(AMOUNT:SUM, CLOSE_DATE) - Gives previous week sum.
PREVGROUPVAL(AMOUNT:SUM, CLOSE_DATE, 2) - Gives 2 weeks before sum.
Cheers!!!