RollingAverageFlag.dax

3 Day Rolling Average 3 = 

VAR __MaxOffset = MAX('Calendar'[CurrDayOffset])-1
VAR __MinOffset = MAX('Calendar'[CurrDayOffset])-3
VAR __PrevMaxOffset = MAX('Calendar'[CurrDayOffset])-2
VAR __PrevMinOffset = MAX('Calendar'[CurrDayOffset])-4
VAR __STDev = CALCULATE(STDEV.P(TimeSeriesData[Value]), ALL(TimeSeriesData))
VAR __Mean = CALCULATE(AVERAGE(TimeSeriesData[Value]), ALL(TimeSeriesData))
VAR __T1 = SUMMARIZE(FILTER(ALL('Calendar'),'Calendar'[CurrDayOffset] >= __MinOffset && 'Calendar'[CurrDayOffset] <= __MaxOffset), "__Value", SUM(TimeSeriesData[Value]))
VAR __T2 = ADDCOLUMNS(__T1,"__Previous_Value", CALCULATE(SUM(TimeSeriesData[Value]), ALL('Calendar'),'Calendar'[CurrDayOffset] >= __PrevMinOffset && 'Calendar'[CurrDayOffset] <= __PrevMaxOffset))
VAR __T3  =ADDCOLUMNS(__T2, "__Percent_Change", DIVIDE([__Value]-[__Previous_Value],[__Previous_Value],BLANK()))
VAR __Result = MAXX(__T3, [__Percent_Change])
RETURN __Result

Test1 = STDEVX.P(ALL(TimeSeriesData),[3 Day Rolling Average 3])
Test2 = AVERAGEX(ALL(TimeSeriesData),[3 Day Rolling Average 3])
Test3 = ABS(DIVIDE([3 Day Rolling Average 3]-[Test2],[Test1]))
Test4 = IF([Test3]>2,1,0)