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Filtering Out Data More Than N Standard Deviations From the Mean

Publish Date: Apr 28, 2025
Steps
The calculation needed to filter data outside of N standard deviations of the mean will depend on how the data is organized and what is used for the 'population'. To filter data outside of 2 standard deviations in a simple view, you can use a calculation similar to the following, where N was equal to 2:
  [Sales]>={ FIXED :AVG([Sales])-N*STDEV([Sales])} AND [Sales]<={ FIXED :AVG([Sales])+N*STDEV([Sales])}

See the attached packaged workbook (.twbx) for an example.

Additional Resources
An EXCLUDE LOD can likely be used in place of FIXED. If FIXED is used, keep in mind Tableau's order of operations.
Knowledge Article Number

001458052

Attachments

Filtering With STD Dev.twbx

1235 KB

 
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