# var

## Syntax

`var(X)`

## Arguments

**X** is a scalar/vector/matrix.

## Details

If *X* is a vector, return the the (unbiased) sample standard variance of
*X*.

If *X* is a matrix, calculate the the (unbiased) sample standard variance of
each column of *X* and return a vector.

As with all aggregate functions, NULL values are not included in the calculation.

Note: The result is sample variance instead of population
variance.