Slope of a Pivot

[QlikSensor]

Hi,

I have a Pivottable which shows quaterly information about products and I need the slope from one quater to another.

Example table:

Product   Q4/2019    Q3/2019   Q2/2019

A                    5                   4                      3

I tried 

LinEst_M(count(distinct valueNumber), after(count(distinct valueNumber)))

But QlikSense throws an error: Nested aggregation not allowed....

Any hints?

[Anil_Babu_Samineni]

Perhaps with TOTAL Qualifier?

LinEst_M(TOTAL count(distinct valueNumber), after(count(distinct valueNumber)))