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Frequent Visitor

## DAX Version of Excel's DSTDEV

New to Power BI but have some experience with Tableau.

Looking to add a measure that calculates the standard deviation for unique categorical values in a column. For example, Column A has a category. Column B has the values on which I need to calculate the standard deviation. I need to calculate the st dev of Column B for all unique categories of Column A. Example data below:

 Column A Column B Name1 204.0730158 Name2 7176.691379 Name3 129.2877416 Name1 205.8627572 Name2 7203.935509 Name3 130.522898 Name1 207.2325321 Name2 7231.588786 Name3 130.8039379

Name1 st dev would use 204.0730158, 205.8627572, and 207.2325321. Name2 and Name3 st deve would follow in similar manner. Hoping to setup a measure that would do all that for me so I can use it in line charts and scatter plots.

Any ideas? Thanks in advance.

1 ACCEPTED SOLUTION

Accepted Solutions
Frequent Visitor

## Re: DAX Version of Excel's DSTDEV

I figured it out. Had to use nested filtering described in this article from 2012.

Measure code looks like this:

calculate(
STDEV.P(Column B)
,FILTER(
ALL('Table')
,COUNTROWS(
FILTER(
'Table'
,EARLIER(Column A) = Column A
)
)
)
)

4 REPLIES 4
Super User II

## Re: DAX Version of Excel's DSTDEV

Create a measure like below:
SD=STDEV.P(Table[SalesAmount])

Don't forget to give thumbs up 👍and accept this as a solution if this helps you.
Member

## Re: DAX Version of Excel's DSTDEV

Measure =

Calculate (

STDEV.P('TableName'[ColumnB]),

ColumnA = "Name1")

Frequent Visitor

## Re: DAX Version of Excel's DSTDEV

Yeah, I thought of that but I need it to dynamically load what goes into the CALCULATE() filter based on the row Power BI is evaluating. So it would be something like:

Calculate (

STDEV.P('TableName'[ColumnB]),

ColumnA = {Value from Column A in row being evaluated})

I just can't figure out how to tell it to do it that way. Another way I've gotten this to work in Excel is using the following formula as an array formula.

=STDEV.P(IF(\$A\$2:\$A\$9000=A2,\$B\$2:\$B\$9000))

Frequent Visitor

## Re: DAX Version of Excel's DSTDEV

I figured it out. Had to use nested filtering described in this article from 2012.

Measure code looks like this:

calculate(
STDEV.P(Column B)
,FILTER(
ALL('Table')
,COUNTROWS(
FILTER(
'Table'
,EARLIER(Column A) = Column A
)
)
)
)

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