Numerical Distribution with Dimension (only new customers over a period)

[#1]

Hi,

I need to calculate the Numerical Distribution (the numbers of new customers by week) so I have used the following expression:

Count(DISTINCT{$<[Date-Invoice Yr]={$(=max([Date-Invoice Yr]))}>}[Cust-BillTo Name])

It works but…as I used it also to identify new customers over time, it doesn’t work if you add a dimension like week: the very same customer can order the next week and then the formula will count it for week 1 and for week 2.

I'd like to count only new customers.

Thanks for your help