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> 计算一个序列的偏度。

# skewPop

<div id="skewPop">
  ## skewPop
</div>

引入于：v20.1.0

计算[序列](https://en.wikipedia.org/wiki/Skewness)的偏度。

**语法**

```sql theme={null}
skewPop(expr)
```

**参数**

* `expr` — 返回数值的表达式。[`Expression`](/zh/reference/data-types/special-data-types/expression)

**返回值**

返回给定分布的偏度值。[`Float64`](/zh/reference/data-types/float)

**示例**

**对称分布**

```sql title=Query theme={null}
SELECT skewPop(number) FROM numbers(100);
```

```response title=Response theme={null}
┌─skewPop(number)─┐
│               0 │
└─────────────────┘
```

**右偏态分布**

```sql title=Query theme={null}
SELECT skewPop(x) FROM (SELECT pow(number, 2) AS x FROM numbers(10));
```

```response title=Response theme={null}
┌─────────skewPop(x)─┐
│ 0.6735701055423582 │
└────────────────────┘
```