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Helper I

## Median per category of summarized Table / Remove Outliers from Data

Hi everyone, I need advice please. I am trying to remove outliers from my data. I have a dim table (dimsailing) and a fact table (shipreadings).

I want to show the aggregated metric per itinerary but without the outliers data:

In the end I also want to calculate the avg, min, max metric per itinerary.

The rule to filter out an an outlier is:

• must be more than 4 sailingkeys per itinerary

• Status = closed

• metric < half of median per itinerary

In the shipreadings table I have Sailingkey, Status and metric, the itinerary comes from the dimsailing. I have used the summarize function to do so:

``````FILTER(
SUMMARIZE('shipreadings', shipreadings[SailingKey], 'dimsailing'[itinerary], dimsailing[SailingStatus],
"TotalFuel", [TotalFuel]
),
[TotalFuel] <> 0
)``````

Outcome is this:

Can anyone solve this? Thanks!

3 REPLIES 3
Community Support

You can create the following calculated columns in your summarize table:

``````Half Median of Metric = CALCULATE(MEDIAN('Table'[metric]),ALLEXCEPT('Table','Table'[itinerary]))/2

Count of SailingKey = CALCULATE(COUNT('Table'[SailingKey]),ALLEXCEPT('Table','Table'[itinerary]))

Outlier = IF('Table'[Count of SailingKey]>4 && 'Table'[Status]="Closed" && 'Table'[metric]<'Table'[Half Median of Metric], 1, 0)``````

Then create a measure and display it in a table visual along with itinerary.

``Total metric without outliers = CALCULATE(SUM('Table'[metric]),'Table'[Outlier]=0)``

Best Regards,
Community Support Team _ Jing
If this post helps, please Accept it as Solution to help other members find it.

Helper I

Hi @v-jingzhang,

I appreciate your help! I have the problem, that the sailingkey and the fuel comes from a fact table where each sailingkey is only once, but the itinerary comes from a dimtable, where the sailingkeys and itinerary are not unique.  Any advice on that? Unfortuneatley I am unable to share my file since it contains sensitive data.

Kind regards, Michella

Community Support

Can you create some dummy data to show the structure and relationships of tables? You can add them into my sample pbix file and share it through a link for download.

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