How to Filter this Measure?

morgancampbell , In this Please, move week, week rank to week table. Create a Separate Week/date table have week Rank there.

That is the best way to make it work.

TWER % LWER =
VAR TWER = CALCULATE(sum('Table'[Email Read]), FILTER(ALL('Week'),'Week'[Week Rank]=max('Week'[Week Rank])))
RETURN
VAR LWER = CALCULATE(sum('Table'[Email Read]), FILTER(ALL('Week'),'Week'[Week Rank]=max('Week'[Week Rank])-1))
RETURN
( IF(
NOT ISBLANK(TWER),
DIVIDE(TWER - LWER, LWER)
)
)

Power BI — Week on Week and WTD
https://medium.com/@amitchandak.1978/power-bi-wtd-questions-time-intelligence-4-5-98c30fab69d3
https://community.powerbi.com/t5/Community-Blog/Week-Is-Not-So-Weak-WTD-Last-WTD-and-This-Week-vs-Last-Week/ba-p/1051123