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Microsoft
Microsoft

Share your thoughts on the new Anomaly detection feature (preview)

Hit Reply to tell us what you think about the new Anomaly detection feature so we can continue to improve.

-Power BI AI team

39 REPLIES 39
Frequent Visitor

Do you know what is the statistical model that identifies the "Expected min value" and the "Expected max value" tresholds?
Thanks.

The expected min/max is controlled by sensitivity (0 - 100%). The higher the sensitivity, the more anomalies and narrow confidence interval (expected min/max).

 

We have some blogs to explain the SR-CNN algorithm used for anomaly detection.

- PowerBI Anomaly Detection

- Overview of SR-CNN algorithm

 

If you are interested in details, you may want to check the ML.Net open source library source code we use, implemented based on SR-CNN model.

 

 

 

 

Frequent Visitor

Hello...

 

I set up Anomaly Detection, and I clicked on the anomaly point on my line graph. But the Anomalies pane does not appear (in PBI Desktop). How do I get the "Anomalies" pane to appear when I click on an anomaly?  Or, are there any conditions where I should expect that it wouldn't appear?

 

Thanks!

Please see limitations documented:

https://docs.microsoft.com/en-us/power-bi/visuals/power-bi-visualization-anomaly-detection

  • Anomaly detection is only supported for line chart visuals containing time series data in the Axis field.
  • Anomaly detection isn't supported with legends, multiple values or secondary values in line chart visual.
  • Anomaly detection requires at least 12 data points.
  • Forecast/Min/Max/Average/ Median/Percentile lines doesn't work with Anomaly detection.
  • Direct Query over SAP data source, Power BI Report Server, Live Connection to Azure Analysis Services and SQL Server Analysis Services aren't supported.
  • Anomaly Explanations doesn't work with 'Show Value As' options.
  • Drilling down to go to the next level in the hierarchy isn't supported.

Thanks, Lisa.

 

I'm experiencing the same issue as Beefmaster as well (anomaly detection pane doesn't show up after selecting an anomaly data point) even after confirming that I am using a line chart visual with time series data in the axis field.  There are no additional values or secondary axes and the legends field is blank.

 

Any thoughts?  Thank you!

You may find the video here useful https://powerbi.microsoft.com/en-us/blog/power-bi-november-2020-feature-summary/#_Toc55467060

 

1. Have you enabled the Preview Feature? 

 

https://docs.microsoft.com/en-us/power-bi/visuals/power-bi-visualization-anomaly-detection

 

2. Note we only support line chart (not area chart or stack line chart), x-axis as date type, and y-axis as numeric values, check if you mark the axis as numeric type. 

 

lisahua46_0-1605285577765.png

lisahua46_1-1605286270960.png

lisahua46_2-1605286342544.png

lisahua46_3-1605286841833.png

 

And the x-axis must be with date type (like above), we do support date hierarchy, yet date hierarchy usually has fewer data points and anomaly detection requires >12 points or more to run a reasonable analysis.

 

3. Make sure you use the latest SU11 Desktop version.  

https://powerbi.microsoft.com/en-us/blog/power-bi-november-2020-feature-summary/

 

If you check all and still have trouble, we may have to get your pbix (you can obfuscate your data) or online dataset access and debug on why.

Thanks, Lisa.  I can confirm that my chart meets all of the requirements you listed above and still nothing happens when I select an anomaly (no anomaly pane).  

 

Let me know how I can get you access to my file with obfuscated data.  Thank you!

Frequent Visitor

Hi - is this feature fully supported in Power BI Embedded? I can see the anomaly indicators and tooltip but clicking on the shape does not open the anomalies panel (we're using .NET SDK v2). 

 

Note: the anomalies panel does display in Desktop and the PBI service.

Helper II
Helper II

I get an error message when using a date hierarchy from my individual date table:

tez_0-1605517167370.png

Any clues, what could be the problem? How has a date hierarchy to be constructed, to be usable for anomaly detection?

Regards,

Thomas.

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