Multiply by amount of days in selected range

[Anonymous]

Hi all,

I am trying to calculate the percentage of days a group of 20 stores is open in Power BI so I can automate the process. I have the data in the current format:

Date	Store number	Closed
01-01-2020	12	1
01-01-2020	7	1
03-01-2020	3	1
04-01-2020	12	1
07-01-2020	4	1
07-01-2020	1	1
08-01-2020	17	1

The calculation I basically want to make: Sum of 'Closed' / (amount of stores*amount of days in selected time frame) * 100, but I am struggling a bit with how to make that work in Power BI.

Many thanks,

E_E

[AlexanderPrime]

Perhaps make a measure with the following code:

Closed PC = (SUM('Table'[Closed])/20)

Then insert this into a table with just Date and Closed present. Then set Closed PC to a "Percentage" data type. I'd recommend against multiplying the results by 100 where possible as Power BI treats percentages as a decimal, with 1 equalling 100%. 

[Anonymous]

Thank you very much.

The problem with a table with 'Closed' is that there are days there is no store closed and these days won't be counted in the percentage if I create such table.

[AlexanderPrime]

Does your data source record those days with 0 closed? Or does it only generate an entry if there is at least one?

[Anonymous]

The latter indeed, basically as in the table above. That's where I get stuck mostly. 

[AlexanderPrime · Accepted solution]

I have a potential workaround but it's a bit rough and I'm sure others can improve it. 

Create a Date Table (I'll call this one Date Table) and populate a column with Dates, form a relationship with the date in that to your main table with the closed results from your original post (I'll call this one Table in this example) 

Add the following Columns to Date Table in DAX.
Total Storage = 20

Closed = CALCULATE(SUM('Table'[Closed]),'Table'[Date])

ClosedCalc = IF(ISBLANK('Date Table'[Closed]),0,('Date Table'[Closed]))

ClosedPC = 'Date Table'[ClosedCalc]/'Date Table'[Total Storage]

That should give you your totals to be able to do a date range calculation if you use either ClosedCalc or ClosedPC. 

I'm certain that Closed, ClosedCalc and ClosedPC should be able to be merged into a single Custom Column but my brain eludes me on that, others may know though!

If you decide to put these into a visual. Use the columns from Date Table to do so. 

[amitchandak]

@Anonymous , Try a measure like

new measure =
var _max = maxx(allselected(Date),Date[Date])
var _min = mainx(allselected(Date),Date[Date])
return
divide( calculate( sum(Table[Closed]), filter('Table', 'Table'[Date] >=_min && 'Table'[Date] <=_max)) , DistinctCOUNT(Store[StoreNumber]) * datediff(_min,_max,day))

Assumed there is store master

[Anonymous]

Thank you very much.

I get some errors with the part 'allselected(Date)', where it says 'parameter isn't the correct type' & cannot find '[Date]' in the 'Date[Date])' part,