# STDEV.P

Returns the standard deviation of the entire population.

## Syntax

```
STDEV.P(<ColumnName>)
```

### Parameters

Term | Definition |
---|---|

columnName | The name of an existing column using standard DAX syntax, usually fully qualified. It cannot be an expression. |

## Return value

A number representing the standard deviation of the entire population.

## Remarks

STDEV.P assumes that the column refers to the entire population. If your data represents a sample of the population, then compute the standard deviation by using STDEV.S.

STDEV.P uses the following formula:

√[∑(x - x̃)

^{2}/n]where x̃ is the average value of x for the entire population and n is the population size.

Blank rows are filtered out from

*columnName*and not considered in the calculations.An error is returned if

*columnName*contains less than 2 non-blank rowsThis function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.

## Example

The following example shows the formula for a measure that calculates the standard deviation of the column, SalesAmount_USD, when the table InternetSales_USD is the entire population.

```
= STDEV.P(InternetSales_USD[SalesAmount_USD])
```