DAX - Rankx by multiple Categories Issue - powerbi

Question

I have 4 Categories (GP, ID, Age, Date). I would would like to create calculated column and group by GP, ID, and Age and Rank/ count by Date to see how many months each member has in past 24 month.
My Code works until I have members who cancelled their membership for a few months and then resumed after. I need to restart from the first month after skip. for example :
GP ID AGE DATE RKING Desired RANK
1 220 35-44 202206 12 6
1 220 35-44 202205 12 5
1 220 35-44 202204 12 4
1 220 35-44 202203 12 3
1 220 35-44 202202 12 2
1 220 35-44 202201 12 1
1 220 35-44 202012 24 24
1 220 35-44 202011 23 23
1 220 35-44 202010 22 22
1 220 35-44 202009 21 21
1 220 35-44 202008 20 20
1 220 35-44 202007 19 19
1 220 35-44 202006 18 18
1 220 35-44 202005 17 17
1 220 35-44 202004 16 16
… … … … … …
1 220 35-44 201901 1 1
This is what I have tried but doesn't work for dates skipping.
RKING Column=
RANKX (
CALCULATETABLE (
VALUES ('tbl'[Date] ),
ALLEXCEPT ( 'tblW', 'tbl'[GP], 'tbl'[ID] ),
'tbl'[AGE] = 'tbl'[AGE],
'tbl'[date] >= start_date && 'tbl'[date] <= end_date // date slicer
),
[Date] ,
,ASC
)

Answer 1

Looking through the code you were trying to make a measure for a visual (For a calcCol the measure is added as well). And as I got a point, you want to show a sum of consequtive months in a matrix for each date in accordance to ID/GP/AGE/DATE I see a following way.
As you know, calculations performs for each row in a matrix and filter the data model according to data presented in matrix rows and columns (slicers as well). So, my idea is -
Get date from matrixRow and use it as max date for the table.
Then use a FILTER(). FILTER() is an iterative function, so it goes throw each row and checks filtering condition - if true row remains if false - not.
I use following filtring conditions:
Get dateInMatrix-dateInACurrentTableRow (for example: 202203-202201= 2 months)
Then check how many rows in the table with min=202201 and max<202203
if there are less rows then date difference then it FALSE() and the row is out of table.
3) The last step is counting of rows it a filtered table.
A measure for matrix:
Ranking =
VAR matrixDate=MAX('table'[DATE])
VAR filteredTable =
FILTER(
ALL('table')
,DATEDIFF(
DATE(LEFT([DATE],4),RIGHT([DATE],2),1)
,DATE(LEFT(matrixDate,4),RIGHT(matrixDate,2),1)
,MONTH
)
=
VAR dateInRow=[DATE]
RETURN
CALCULATE(
COUNTROWS('table')
,'table'[DATE]>=dateInRow
,'table'[DATE]<matrixDate
)
)
RETURN
COUNTROWS(filteredTable)
[![enter image description here][1]][1]
A measure for calcColl:
RankColl =
VAR currentDate=[Start_Date]
Var MyFilt={('Table'[AGE],'Table'[ID],'Table'[GROUP])}
VAR withColl =
ADDCOLUMNS(
CALCULATETABLE(
'table'
,ALL('Table')
,TREATAS(MyFilt,'Table'[AGE],'Table'[ID],'Table'[GROUP])
)
,"dateDiff",
DATEDIFF(
[Start_Date]
,currentDate
,MONTH
)
,"RowsInTable",
VAR dateInRow=[Start_Date]
Var startDate=IF(dateInRow<currentDate,dateInRow,currentDate)
VAR endDay =IF(dateInRow>currentDate,dateInRow,currentDate)
VAR myDates = GENERATESERIES(startDate,endDay,1)
RETURN
COUNTROWS(
CALCULATETABLE(
'Table'
,ALL('Table')
,TREATAS(MyFilt,'Table'[AGE],'Table'[ID],'Table'[GROUP])
,TREATAS(myDates,'Table'[Start_Date])
)
)
)
VAR filtered =
FILTER(
withColl
,[dateDiff]=[RowsInTable]-1 -- for ex.:
-- dateDiff=01/01/2022-01/01/2022=0,
-- but it will be 1 row in the table for 01/01/2022
)
RETURN
CountRows( filtered)