Description Usage Arguments Value Examples

This function takes a random sample and produces an unbiased estimate of the squared variance based on the U-statistic $sum_k1 ne k2 ne k3 ne k4 (x_k1-x_k2))^2 (x_k3-x_k4))^2$.

1 | ```
sigma4(x)
``` |

`x` |
is a vector of i.i.d. observations. |

unbiased estimate of squared variance $sigma^4$, where $sigma^2$ is the variance.

1 2 |

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