CONFIDENCE.NORM DAX Function (Statistical)

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

Syntax

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

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.

Standard_dev

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

Size

The sample size.

Return values

Scalar A single decimal value.

Remarks

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.

Examples

--  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
DEFINE
    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
EVALUATE
{
    ( "AVERAGE",          Mean ),
    ( "STDEV.S",          StandardDev ),
    ( "CONFIDENCE.NORM",  CONFIDENCE.NORM ( Alpha, StandardDev, SampleSize ) ),
    ( "CONFIDENCE.T",     CONFIDENCE.T    ( Alpha, StandardDev, SampleSize ) )
}

Value1 Value2
AVERAGE 5.00
STDEV.S 2.14
CONFIDENCE.NORM 1.48
CONFIDENCE.T 1.79

Last update: Oct 3, 2024   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo

Microsoft documentation: https://docs.microsoft.com/en-us/dax/confidence-norm-function-dax

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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.

Iterator

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.

Deprecated

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

Volatile

A volatile function may return a different result every time you call it, even if you provide the same arguments. Click to read more.

Deprecated

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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