# std() Function & Examples

Use the std() statistics function in Calcul.io. Review its syntax, edit working examples, understand the result, and explore related math functions.

## std

#### std(a, b, c, ...)

#### std(A)

#### std(A, dimension)

#### std(A, normalization)

#### std(A, dimension, normalization)

Try it yourself:

```calculio
std(2, 4, 6)
std([2, 4, 6, 8])
std([2, 4, 6, 8], "uncorrected")
std([2, 4, 6, 8], "biased")
std([1, 2, 3; 4, 5, 6])
```

[max](https://calcul.io/function/max/index.md)

[mean](https://calcul.io/function/mean/index.md)

[min](https://calcul.io/function/min/index.md)

[median](https://calcul.io/function/median/index.md)

[prod](https://calcul.io/function/prod/index.md)

[sum](https://calcul.io/function/sum/index.md)

[variance](https://calcul.io/function/variance/index.md)

---

## std(): Standard Deviation

**std()** measures how widely values vary around their mean. A small standard deviation indicates tightly clustered data; a large value indicates greater spread.

## Population or sample

Choose the appropriate normalization for a full population versus a sample. Pair std with [mean()](https://calcul.io/function/mean/index.md) for interpretation and [variance()](https://calcul.io/function/variance/index.md), whose square root is standard deviation. Use [mad()](https://calcul.io/function/mad/index.md) when a less outlier-sensitive spread measure is useful.

Data should use consistent units, and missing values should be handled before calculation. Standard deviation shares the input’s units, unlike variance.

[All functions](https://calcul.io/functions/index.md)