Kurtosis is a measure of the "tailedness" of the probability distribution of a real-valued random variable. A normal distribution has a kurtosis of 3 and a excess kurtosis of 0.

## Usage

```
kurtosis(x, na.rm = FALSE, excess = FALSE)
# S3 method for default
kurtosis(x, na.rm = FALSE, excess = FALSE)
# S3 method for matrix
kurtosis(x, na.rm = FALSE, excess = FALSE)
# S3 method for data.frame
kurtosis(x, na.rm = FALSE, excess = FALSE)
```

## Arguments

- x
a vector of values, a matrix or a data.frame

- na.rm
a logical to indicate whether

`NA`

values should be stripped before the computation proceeds- excess
a logical to indicate whether the

*excess kurtosis*should be returned, defined as the kurtosis minus 3.