Trend Visualization compared to previous week

[TimonMeyer]

Hi,

I try to visualize a change in a number (a sum of trucks per week) compared to the previous calender week.

For example...in Calendar Week 15 I counted 380 and in Calendar week 16 I counted 368. I now want to have a visual where I see a trend based on the previous week. In this case a negativ trend as the number went down.

Problem for me is to define something which is only looking at the previous CW.

Yes I´m working with a date table and already sorted out how to add a WeekNum in there.

Please note that I´m quite new to PBI.

Thanks for your help.

[Greg_Deckler]

Can you post some mock data in text that can be easily copied and pasted? Please see this post regarding How to Get Your Question Answered Quickly: https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490

In general however, you should be able to create a measure that does a MAX of your weeknum and then you would use FILTER(ALL(),[weeknum]=yourmax) like:

Measure = 
VAR myMax = MAX('Table'[WeekNum])
VAR myCount = SUM('Table'[Trucks])
VAR tmpTable = FILTER(ALL('Table'),[WeekNum]=myMax-1)
VAR lastWeekCount = COUNTX(tmpTable,[Trucks])
RETURN myCount - lastWeekCount

Totally guessing here because no mock data.

[TimonMeyer]

Hi Greg,

Sorry I read your post too late.

I was able to adjust the formula given above

Trend Truck = 
VAR myMax = MAX('Date'[WeekNum])
VAR myCount = SUM('Table1'[Anzahl Trucks])
VAR tmpTable = FILTER(ALL('Date');[WeekNum]=myMax-1)
VAR lastWeekCount = COUNTX(tmpTable;[Anzahl Trucks])
RETURN myCount - lastWeekCount  

I think I understand what you did there but what does "myMax-1" do?

What Visual would you use to display a trend "this week compared to last week"?

Thanks for your help so far!

[Greg_Deckler · Accepted solution]

The myMax variable is essentially grabbing the current weeknum in the context of your visual. So, myMax - 1 essentially dials this back a week. So, if your current week is 16, when you are filtering for last week you want the rows where WeekNum is 15.

[corbusier]

How would this work when last week is actually in last year? 

[TimonMeyer]

Thanks! I somehow managed to get the data right.

THX!

[LexiQiang]

Don't worry.

I just realised how to work it out by myself.

[LexiQiang]

Hi Timon,

Could you please share the way you do this visual? I'm new to Power BI and what I'm trying to do is to put two numbers in comparison on one single card and show the variance aside, which is just what you did. 

Thank you!

Lexi