| Excerpt |
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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 |
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NOTE: This function applies to a sample of the entire population. More information is below. |
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 lang syntax |
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| RawWrangle | true |
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| Type | ref |
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| showNote | true |
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| WrangleText | pivot value:stdev(myRating) group: postal_code limit:1 |
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stdevsamp(myRating) |
Output: Returns the standard deviation of the values from the myRating column using the sample method of calculation.
| D lang syntax |
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| RawWrangle | true |
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| Type | syntax |
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| showNote | true |
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| WrangleText | pivot value:stdev(function_col_ref) [group:group_col_ref] [limit:limit_count] |
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stdevsamp(col_ref) [group:group_col_ref] [limit:limit_count] |
| Argument | Required? | Data Type | Description |
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| function_col_ref | Y | string | Name of column to which to apply the function |
For more information on the group and limit parameters, see Pivot Transform.
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.
| Required? | Data Type | Example Value |
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| Yes | String (column reference) | myValues |
| Include Page |
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| EXAMPLE - Statistical Functions Sample Method |
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| EXAMPLE - Statistical Functions Sample Method |
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