Cumulative Percent only displaying when there is a number present

Question

Hi
I am using the below cumulative percent formula for a chart and pivot table display (see below code). The problem is that the cumulative percent and cumulative number are only showing up in the pivot table when there is a number to cumulate (see below screenshot).
While this makes sense logically, I would like to see the value in the prior row appear when there is no value to cumulate so that there is always a value displaying for the user--see second screenshot.
Does anyone know if there is a way to do this?
Paul
Code:
=(CALCULATE(countrows(s1Perm1),FILTER(ALL(s1Perm1[ExitMonthCategory]),s1Perm1[ExitMonthCategory] <= MAX(s1Perm1[ExitMonthCategory]))))/(CALCULATE(COUNTROWS(s1Perm1),ALL(s1Perm1[Exit],s1Perm1[ExitMonthCategory])))
Current result:
Desired Result:

Answer 1

Hi Greg
I tried your solution above and it works from the perspective that it can provide the cumulative number and cumulative percent for a column where the values in the column are all present.
However, the column I am using represents exit months from foster care actually. There are different month values in the column: .5,1,2,3,4,5,6,9,12,15,18,21,24..... With the exception of .5 to 6 months, they are in 3 month intervals. For this particular
table, I would like to show only those month values that represent 6 month intervals: 6, 12, 18, 24.....
When I do this, the cumulative number only sums the values for the columns that are present in the table and not all the actual values. This gives a different number and is not correct.
Is there a way to get the above function to aggregate all values of a column even when not all values are displayed in the pivot table?
The function I am using is:
=countrows(s1Perm1)
Correctly aggregating values for exit months when they are all present:
When I only display 6 month intervals, only those values present for the column are cumulatively summing. This is not correct: