Let's use the PREVGROUPVAL() function in the Matrix report.
We would like to know the percentage of growth for Total Amount for each month:
- Create a Matrix report and group by Close Date (by Calendar Month) as the row grouping and Stage as the column grouping.
- Hide Remove Count, and hide Details. Filter only Open and Won opportunities.
- Create a formula summary called Month by Month; group it as Closed Date (by Calendar Month) and Column Grand Summary.
- Set the summary format to Percent with two decimal points.
- Enter this formula: (AMOUNT:SUM - PREVGROUPVAL(AMOUNT:SUM, CLOSE_DATE)) / PREVGROUPVAL(AMOUNT:SUM, CLOSE_DATE):
The summary formula will be added next to amount subtotal for each ...