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variance() (aggregation function)
Applies to: ✅ Microsoft Fabric ✅ Azure Data Explorer ✅ Azure Monitor ✅ Microsoft Sentinel
Calculates the variance of expr across the group, considering the group as a sample.
Null values are ignored and don't factor into the calculation.
The following formula is used:
Note
This function is used in conjunction with the summarize operator.
Syntax
variance(expr)
Learn more about syntax conventions.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
| expr | real |
✔️ | The expression used for the variance calculation. |
Returns
Returns the variance value of expr across the group.
Example
range x from 1 to 5 step 1
| summarize make_list(x), variance(x)
Output
| list_x | variance_x |
|---|---|
| [ 1, 2, 3, 4, 5] | 2.5 |