Comparing actual to previous month relative to week number

[Anonymous]

Hello Power BI Community, 

I have a problem with comparing the data from the actual month with the previous month. For my managment revenue-report I want to show to tables with the revenue figures of the acutal and the previous month, seperated into 4 Weeks. The table should look like the following one: 

Region	1. Week	2. Week	3. Week	4. Week
Germany	###	###
East Europe	###
West Europe
North America

What I did so far was creating two measures: 

Spoiler

revenue am = CALCULATE(SUM(Data[revenue]))
revenue pm = CALCULATE(SUM(Data[revenue]), PREVIOUSMONTH(Date[date]))

And they both work out very well. To seperate the revenue into 4 weeks I created a date table, where all the dates are assigned to a week number, so 1st-7th = 1. Week, 8th-14th = 2. Week and so on. 

Than I creates a matrix visiual with regions in the rows, weeks from the date table in the columns and the two measures provide the data. This concept works out very well form the data of the actual month, but for some reason it doesn't work for the previous month matrix. In fact my two tables look like this: 

Actual Month

Region	1. Week	2. Week	3. Week	4. Week	Sum
Germany	25	25	25	25	100
East Europe	25	25	25	25	100
West Europe	25	25	25	25	100
North America	25	25	25	25	100
Sum	100	100	100	100	400

Previous Month

Region	1. Week	2. Week	3. Week	4. Week	Sum
Germany	100	100	100	100	100
East Europe	100	100	100	100	100
West Europe	100	100	100	100	100
North America	100	100	100	100	100
Sum	400	400	400	400	400

So I am asking for your support, helping me to solve the problem or coming up with another interesting idea to achieve my goals. 

Thank you!

Best regards 

Julius

*Unfortunatly I am not able to upload pictures, so I hope my table examples above show were the problem could be. If you have any further questions just ask me. 

[Anonymous]

@Anonymous Hi Julius,

May I ask a quesiton... I'd also like to seperate my data into 4 weeks each month while I am not sure how to assigne week number like what you have done (1st-7th = 1. Week, 8th-14th = 2). Right now I am using WEEKNUM with the fomula:

1 + WEEKNUM (Index[Date])-WEEKNUM(STARTOFMONTH (Index[Date]))

but it sets week based on weekday, so for example 2021/02/01 is a monday, than only 2021/02/01-2021/02/06 will be set as week 1, but what I want is 1st-7th every month being set as week 1... Could you please kindly share how you did it?

Many thanks!

[AllisonKennedy]

Is your date table a true date table and has it been marked as a date table? For previous month to work, you will need to select a month, have you got a slicer for that as I don't see it in your table?
https://excelwithallison.blogspot.com/2020/04/dimdate-what-why-and-how.html

[Anonymous]

Hey @AllisonKennedy ,

thank you for your fast support. 

My date table looks like this:

Its in german, I hope your are not confused. And yes there is a slicer on the page. 

[amitchandak]

@Anonymous , the previous month should work. can you share formula?

[AllisonKennedy]

@amitchandak the previous month formula was shared in original post under spoiler:

revenue am = CALCULATE(SUM(Data[revenue]))
revenue pm = CALCULATE(SUM(Data[revenue]), PREVIOUSMONTH(Date[date]))

[AllisonKennedy · Accepted solution]

Thanks @Anonymous

Try using DATEADD instead of PreviousMonth, because PreviousMonth will give you all dates in the previous month, while DATEADD will shift the current dates (keeping the week number filter).

revenue pm = CALCULATE(SUM(Data[revenue]), DATEADD(Date[date], -1, Month))

[Anonymous]

Hey @AllisonKennedy ,

thank you for the solution. The formula does work perfectly. In fact I tried it before and it didn't work, maybe because the date table was not declared as a date table. With adjusting the settings of the date table and rewriting the dax formula with DATEADD it now works. 

Thanks to everybody for your support!

Best regards 

Julius

[FarhanAhmed]

Have you marked your date table as "Date Table"

[amitchandak]

@Anonymous , what is the formula used for previous month?

Can you share sample data and sample output in table format?

refer

Power BI — MTD Questions — Time Intelligence 3–5
https://medium.com/@amitchandak.1978/power-bi-mtd-questions-time-intelligence-3-5-64b0b4a4090e
Power BI — WTD Questions— Time Intelligence 4–5
https://medium.com/@amitchandak.1978/power-bi-wtd-questions-time-intelligence-4-5-98c30fab69d3