CONFIDENCE.T DAX Function (Statistical)

Returns the confidence interval for a population mean, using a Student’s t distribution.


CONFIDENCE.T ( <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.

Returns the confidence interval for a population mean, using a Student’s t distribution.


--  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: Jul 12, 2024   » 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.


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


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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