previous row calculations

ellevy try this measure for previous year

Prev Year and Week = 
VAR __currentYear = MAX ( Table[Year] )
VAR __prevYear = __currentYear - 1
VAR __currentWeek = MAX ( Table[Week in Year] )
RETURN
CALCULATE (
SUM ( Table[Number of People] ),
Table[Year] = __currentYear,
Table[Week in Year] = __currentWeek
) 

Check my latest blog post Year-2020, Pandemic, Power BI and Beyond to get a summary of my favourite Power BI feature releases in 2020

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