# EXPON.DISTDAX Function (Statistical)

Returns the exponential distribution. Use EXPON.DIST to model the time between events, such as how long an automated bank teller takes to deliver cash. For example, you can use EXPON.DIST to determine the probability that the process takes at most 1 minute.

## Syntax

EXPON.DIST ( <X>, <Lambda>, <Cumulative> )
Parameter Attributes Description
X

The value of the function.

Lambda

The parameter value.

Cumulative

A logical value that indicates which form of the exponential function to provide. If cumulative is TRUE, EXPON.DIST returns the cumulative distribution function; if FALSE, it returns the probability density function.

## Return values

Scalar A single decimal value.

## Examples

```--  Given the lambda parameter to define the power, EXPON.DIST returns the
--  exponential distribution of a value, or the cumulative distribution
--  depending on its third argument
--
--  https://en.wikipedia.org/wiki/Exponential_distribution
DEFINE
VAR Vals       = GENERATESERIES ( 0, 5, 0.5 )
VAR Lambda     = 0.8
VAR CumulativeTrue  = TRUE   -- Cumulative distribution function
VAR CumulativeFalse = FALSE  -- Probability density function
EVALUATE
Vals,
"EXPON.DIST",  EXPON.DIST ( [Value], Lambda, CumulativeFalse ),
"EXPON.DIST Cumulative",  EXPON.DIST ( [Value], Lambda, CumulativeTrue )
)
```
Value EXPON.DIST EXPON.DIST Cumulative
0.00 0.80 0.00
0.50 0.54 0.33
1.00 0.36 0.55
1.50 0.24 0.70
2.00 0.16 0.80
2.50 0.11 0.86
3.00 0.07 0.91
3.50 0.05 0.94
4.00 0.03 0.96
4.50 0.02 0.97
5.00 0.01 0.98

Last update: Oct 15, 2021     » Show contributors

Contributors: Alberto Ferrari, Marco Russo

Microsoft documentation: https://docs.microsoft.com/en-us/dax/expon-dist-function-dax

# 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.

# Deprecated

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

# 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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