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D toc

Excerpt

Computes the standard deviation across column values of Integer or Decimal type using the sample statistical method.

The standard deviation of a set of values attempts to measure the spread in values around the mean and is used to measure confidence in statistical results. A standard deviation of zero means that all values are the same, and a small standard deviation means that the values are closely bunched together. A high value for standard deviation indicates that the numbers are spread out widely. Standard deviation is always a positive value.

Info

NOTE: This function applies to a sample of the entire population. More information is below.

D s terms
area stat_sampling

• This function is calculated across a sample of all values.

• For more information on a population version of this function, see STDEV Function.

If a row contains a missing or null value, it is not factored into the calculation. If no numeric values are detected in the input column, the function returns `0`.

The square of standard deviation is variance. See VAR Function.

For a version of this function computed over a rolling window of rows, see ROLLINGSTDEV Function.

D s lang vs sql

D s
snippet Basic

D lang syntax
RawWrangle true ref true pivot value:stdev(myRating) group: postal_code limit:1

stdevsamp(myRating)

Output: Returns the standard deviation of the values from the `myRating` column using the sample method of calculation.

D s
snippet Syntax

D lang syntax
RawWrangle true syntax true pivot value:stdev(function_col_ref) [group:group_col_ref] [limit:limit_count]

stdevsamp(col_ref) [group:group_col_ref] [limit:limit_count]

ArgumentRequired?Data TypeDescription
function_col_refYstringName of column to which to apply the function

For more information on the `group` and `limit` parameters, see Pivot Transform.

D s lang notes

### col_ref

Name of the column whose values you wish to use in the calculation. Column must be a numeric (Integer or Decimal) type.

• Literal values are not supported as inputs.
• Multiple columns and wildcards are not supported.

D s
snippet usage

Required?Data TypeExample Value
YesString (column reference)`myValues`

D s
snippet Examples

Include Page
 EXAMPLE - Statistical Functions Sample Method EXAMPLE - Statistical Functions Sample Method

D s also
label aggregate