Remove Tail End of Indexing from Cohort Periods

[BICrazy]

Hello Power BI Community,

Last week I got some help to exclude the data that is blank and I'm using the following measure to display the percentages per Cohort ( Currently columns 1 - 14).

Cohorts = IF( [MoM % Change from Previous Index] = 0 , BLANK(), [MoM % Change from Previous Index] )

I now need help to create a DAX measure that enables the user to choose to remove the last 3 periods from the visual per row.
** Note that this is not merely chopping off columns 12, 13, and 14 from the end, but rather removing the last 3 columns of data at a ROW level.  My objective is to remove the dips that are currently being displayed in the Line Chart Visual.

[Fowmy · Accepted solution]

@BICrazy 
I have modified your measure to exclude the last three values for each row:

New Cohorts= 
VAR _DATE = 
CALCULATE(MAX(Data[date]), ALLSELECTED(Data[Date],Data[Day])) - 3 
return
IF( 
    MAX(Data[Date])  <= _DATE,
    [Cohorts]
)

________________________

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[BICrazy]

@Fowmy 

Thank you again Sir!.  This measure is exactly what I needed for my dashboard.