Nested Set Analysis Calculation

[#1]

Hi,

I have a column called visit frequency and i find the average of visit frequency for every shop for the particular date range using set analysis.This expression works fine.

Avg({<Date = {">=$(=addmonths(only([First Date]),0))<=$(=addmonths(only([Last Date]),0))"},Month=,Week=>} [Visiting Frequency])

Next i have to calculate the number of shops corresponding to the average visit frequency for the same date range by using the above expression.

Please help me out to solve the problem.