stdev()(聚合函数)stdev() (aggregation function)

将该组作为示例,计算组内 Expr 的标准偏差。Calculates the standard deviation of Expr across the group, considering the group as a sample.

  • 使用的公式:Used formula:

Stdev 示例

  • 只能在 summarize 内的聚合上下文中使用Can be used only in context of aggregation inside summarize

语法Syntax

summarize stdev(Expr)summarize stdev(Expr)

参数Arguments

  • Expr:用于聚合计算的表达式。Expr : Expression that will be used for aggregation calculation.

返回Returns

组内 Expr 的标准偏差值。The standard deviation value of Expr across the group.

示例Examples

range x from 1 to 5 step 1
| summarize make_list(x), stdev(x)

list_xlist_x stdev_xstdev_x
[ 1, 2, 3, 4, 5][ 1, 2, 3, 4, 5] 1.581138830084191.58113883008419