Finding previous date's value in one column based on another column

[Anonymous]

Hello everyone,

I really got stuck with this one. I can't find any help for the PREVIOUSDAY function. I need to add a column with the previous date's value for a certain value in another column. My dates are not continuous. Example:

Segment             Date        UniqueOpenRate
WiFi                    1/3/2020 15%
Hotel concierge 1/3/2020 14%
WiFi                    2/3/2020 16%
Hotel Concierge 2/3/2020 13%

I need to be able to add a new column where I set the previous value for each Segment:

Segment            Date        PrevOpenRate
WiFi                   2/3/2020 15%

How can I do that?
Thanks!
Stan

[az38]

Hi @Anonymous 

try Measure

Measure = 
var _curDate = MAX('Table'[Date])
var _prevDate = CALCULATE(MAX('Table'[Date]), ALLEXCEPT('Table','Table'[Segment]),'Table'[Date] < _curDate)

RETURN

CALCULATE(SUM('Table'[UniqueOpenRate]), FILTER(ALLEXCEPT('Table','Table'[Segment]),'Table'[Date] = _prevDate))

[Anonymous · Accepted solution]

This works! Thank you so much! Yuu saved me so much time!