Skip to main content
cancel
Showing results for 
Search instead for 
Did you mean: 

Calling all Data Engineers! Fabric Data Engineer (Exam DP-700) live sessions are back! Starting October 16th. Sign up.

Reply
justlogmein
Helper III
Helper III

Formula for detecting local (contextual) outliers in DAX

I have created a calculated column that looks for global outliers but have found that the be insufficient as I have some data in there that, over the entire dataset, is ok but it is obviously incorrect if you look at the values around it.

justlogmein_0-1657348178536.png

I can't find a simple formula for this that I can use in DAX. Does anyone know how I could modify the DAX below so it looked at the surrounding values (excluding values that are already marked as a global outlier) and marked any anomilies?

 

=
var Q1 = 
CALCULATE
	(
	PERCENTILE.INC
		(
		'sampleDataForCalcs'[Machine Hours - Raw],0.25
		),
	FILTER
		(
		ALLEXCEPT
			(
			'sampleDataForCalcs',
			'sampleDataForCalcs'[Unit Number]
			),
		'sampleDataForCalcs'[Machine Hours - Raw] > 0
		)
	)
var Q3 = 
CALCULATE
	(
	PERCENTILE.INC
		(
		'sampleDataForCalcs'[Machine Hours - Raw],0.75
		),
	FILTER
		(
		ALLEXCEPT
			(
			'sampleDataForCalcs',
			'sampleDataForCalcs'[Unit Number]
			),
		'sampleDataForCalcs'[Machine Hours - Raw] > 0
		)
	)
var IQR = Q3 - Q1
var low = Q1 - 1.5*IQR
var high =  Q3 + 1.5*IQR
var outlier =
IF
	(
	'sampleDataForCalcs'[Machine Hours - Raw] < low
	||
	'sampleDataForCalcs'[Machine Hours - Raw] > high,
	"TRUE",
	BLANK()
	)
return outlier

 

2 REPLIES 2
justlogmein
Helper III
Helper III

Thanks, but these are not what I am looking for.

amitchandak
Super User
Super User

@justlogmein , refer if these can help outlier

https://community.powerbi.com/t5/Desktop/Removing-X-outlier-records/m-p/555551

https://bielite.com/blog/scale-down-outliers-power-bi/

https://datacornering.com/how-to-identify-outliers-in-microsoft-power-bi/

Share with Power BI Enthusiasts: Full Power BI Video (20 Hours) YouTube
Microsoft Fabric Series 60+ Videos YouTube
Microsoft Fabric Hindi End to End YouTube

Helpful resources

Announcements
FabCon Global Hackathon Carousel

FabCon Global Hackathon

Join the Fabric FabCon Global Hackathon—running virtually through Nov 3. Open to all skill levels. $10,000 in prizes!

FabCon Atlanta 2026 carousel

FabCon Atlanta 2026

Join us at FabCon Atlanta, March 16-20, for the ultimate Fabric, Power BI, AI and SQL community-led event. Save $200 with code FABCOMM.