Bring previous data and calculate difference

[Anonymous]

Hi, I'm trying to do something like this

 

When the identification matches, it brings the water level from the previous date and also in another column it makes the difference between the current water level and the previous water level.

I think it's something with the previous function and the filter, but I could not make it work

Any ideas?

Thank you!

[v-danhe-msft]

Hi @Anonymous,

Could you please tell me if your problem has been solved? If it is, could you please mark the helpful replies as Answered to close this topic?

Regards,

Daniel He

[v-danhe-msft · Accepted solution]

Hi @Anonymous,

Based on my test, you could refer to below steps:

Sample data:

Create below calculated columns:

Index = RANKX('Table1','Table1'[Date],,ASC,Dense)

previous number = var a=[Index]-1
return CALCULATE(SUM(Table1[Number]),FILTER('Table1','Table1'[Index]=a))

Difference = IF(ISBLANK('Table1'[previous number]),BLANK(),[Number]-[previous number])

Result:

You could also download the pbix file to have a view.

Regards,

Daniel He

[Greg_Deckler]

You want EARLIER. See my article on Mean Time Before Failure (MTBF) which uses EARLIER: http://community.powerbi.com/t5/Community-Blog/Mean-Time-Between-Failure-MTBF-and-Power-BI/ba-p/3395...

[Greg_Deckler]

You want EARLIER. See my article on Mean Time Before Failure (MTBF) which uses EARLIER: http://community.powerbi.com/t5/Community-Blog/Mean-Time-Between-Failure-MTBF-and-Power-BI/ba-p/3395...