CONFIDENCE.NORM DAX Function (Statistical)

Returns the confidence interval for a population mean, using a normal distribution.


CONFIDENCE.NORM ( <Alpha>, <Standard_dev>, <Size> )
Parameter Attributes Description

The significance level used to compute the confidence level. The confidence level equals 100*(1 – alpha)%, or in other words, an alpha of 0.05 indicates a 95 percent confidence level.


The population standard deviation for the data range and is assumed to be known.


The sample size.

Return values

Scalar A single decimal value.


The confidence interval is a range of values. Your sample mean, x, is at the center of this range and the range is x ± CONFIDENCE.NORM. For example, if x is the sample mean of delivery times for products ordered through the mail, x ± CONFIDENCE.NORM is a range of population means.


--  CONFIDENCE.NORM returns the confidence interval
--  for a population mean, assuming a normal distribution
--  CONFIDENCE.T uses a Student's T distribution instead
--      CONFIDENCE.NORM ( Alpha, StandardDev, SampleSize )
--  Confidence level equals 100*(1-alpha)%
--  Alpha 0.05 indicates a 95% confidence level
    TABLE SampleData = { 2, 4, 4, 4, 5, 5, 7, 9 }
    VAR Mean         = AVERAGE ( SampleData[Value] )
    VAR StandardDev  = STDEV.S ( SampleData[Value] )
    VAR SampleSize   = COUNTROWS ( SampleData )
    VAR Alpha        = 0.05 -- 95% confidence level
    ( "AVERAGE",          Mean ),
    ( "STDEV.S",          StandardDev ),
    ( "CONFIDENCE.NORM",  CONFIDENCE.NORM ( Alpha, StandardDev, SampleSize ) ),
    ( "CONFIDENCE.T",     CONFIDENCE.T    ( Alpha, StandardDev, SampleSize ) )

Value1 Value2
STDEV.S 2.14

Last update: Nov 23, 2021   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo

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Context Transition

This function performs a Context Transition if called in a Row Context. Click to read more.

Row Context

This expression is executed in a Row Context. Click to read more.


Not recommended

The use of this function is not recommended. See Remarks and Related functions for alternatives.

Not recommended

The use of this parameter is not recommended.


This function is deprecated. Jump to the Alternatives section to see the function to use.


This parameter is deprecated and its use is not recommended.

DirectQuery compatibility

Limitations are placed on DAX expressions allowed in measures and calculated columns.
The state below shows the DirectQuery compatibility of the DAX function.


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