Power BI DAX - find repeatability - sql

Question

Given data as such:
Month ValueA
1 T
2 T
3 T
4 F
Is there a way to make a measure that would find if for each month, last three Values were True?
So the output would be (F,F,T,F)?
That would propably mean that my actual problem is solvable, which is finding from:
Month ValueA ValueB ValueC
1 T F T
2 T T T
3 T T T
4 F T F
the count of those booleans for each row, so the output would be (0,0,2[A and C],1[B])
EDIT:
Okay, I managed to solve the first part with this:
Previous =
VAR PreviousDate =
MAXX(
FILTER(
ALL( 'Table' ),
EARLIER( 'Table'[Month] ) > 'Table'[Month]
),
'Table'[Month]
)
VAR PreviousDate2 =
MAXX(
FILTER(
ALL( 'Table' ),
EARLIER( 'Table'[Month] ) - 1 > 'Table'[Month]
),
'Table'[Month]
)
RETURN
IF(
CALCULATE(
MAX( 'Table'[Value] ),
FILTER(
'Table',
'Table'[Month] = PreviousDate
)
) = "T"
&& CALCULATE(
MAX( 'Table'[Value] ),
FILTER(
'Table',
'Table'[Month] = PreviousDate2
)
) = "T"
&& 'Table'[Value] = "T",
TRUE,
FALSE
)
But is there a way to use it with unknown number of columns?
Without hard - coding every column name? Like a loop or something.

Answer 1

I would redo the data table in power query (upivoting the ValueX-columns) and changing T/F to 1/0. Then have a dim table with a relationship to Month, like this:
Then add a measure like this:
Three Consec T =
var maxMonth = MAX('Data'[Month])
var tempTab =
FILTER(
dimMonth;
'dimMonth'[MonthNumber] <= maxMonth && 'dimMonth'[MonthNumber] > maxMonth -3
)
var sumMonth =
MAXX(
'dimMonth';
CALCULATE(
SUM('Data'[OneOrZero]);
tempTab
)
)
return
IF(
sumMonth >= 3;
"3 months in a row";
"No"
)
Then I can have a visual like this when the slicer indicates which time window I'm looking at and the table shows if there has been 3 consecutive Ts or not.