stdevif() (aggregation function)
Applies to: ✅ Microsoft Fabric ✅ Azure Data Explorer ✅ Azure Monitor ✅ Microsoft Sentinel
Calculates the standard deviation of expr in records for which predicate evaluates to true.
Null values are ignored and don't factor into the calculation.
Note
This function is used in conjunction with the summarize operator.
Syntax
stdevif(expr,predicate)
Learn more about syntax conventions.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
| expr | string |
✔️ | The expression used for the standards deviation aggregation calculation. |
| predicate | string |
✔️ | The predicate that has to evaluate to true in order for expr to be added to the result. |
Returns
Returns the standard deviation value of expr in records for which predicate evaluates to true.
Example
The following example shows the standard deviation in a range of 1 to 100.
range x from 1 to 100 step 1
| summarize stdevif(x, x % 2 == 0)
Output
| stdevif_x |
|---|
| 29.1547594742265 |