Line graph with Set Analysis and cumulative data

[Polor1993]

I need help to create a formula to a line chart. I want to create a chart using set analysis to specify a range of the axis x (I want just a sample of the dimension I selected), and at the same time I want it to be a cumulative line graph. For example:

Month                                  Value
November 2020                300
December 2020                150
January 2021                    250
February 2021                  175
March 2021                        450

In this example, I want my graph to cover only between December 2020 and March 2021 and to be cumulative, with 150 for December, 400 for January, 575 for February...

How can I create an expression for a line chart like that?

Thanks a lot!

[BrunPierre · Accepted solution]

=RangeSum(Above(Sum({<Month={"*"}-{'November 2020'}>}Value),0,RowNo()))

[Polor1993]

Thanks! It really helped me. But just another question: do you know how can I apply the same expression but in order to always represent between the range of maximum month date until the last 12 months? I try to use the max function inside the set analysis, but I got confused how apply for this case.