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# skewSamp {#skewsamp}

Computes the [sample skewness](https://en.wikipedia.org/wiki/Skewness) of a sequence.

It represents an unbiased estimate of the skewness of a random variable if passed values form its sample.

``` sql
skewSamp(expr)
```

**Parameters**

`expr` — [Expression](../../../sql-reference/syntax.md#syntax-expressions) returning a number.

**Returned value**

The skewness of the given distribution. Type — [Float64](../../../sql-reference/data-types/float.md). If `n <= 1` (`n` is the size of the sample), then the function returns `nan`.

**Example**

``` sql
SELECT skewSamp(value) FROM series_with_value_column
```