# BB8Copula: Constructors for BB8 copulas In VC2copula: Extend the 'copula' Package with Families and Models from 'VineCopula'

## Description

Constructs an object of the BB8Copula (survival `sur`, 90 degree rotated `r90` and 270 degree rotated `r270`) family for given parameters.

## Usage

 ```1 2 3 4 5 6 7``` ```BB8Copula(param = c(1, 1)) surBB8Copula(param = c(1, 1)) r90BB8Copula(param = c(-1, -1)) r270BB8Copula(param = c(-1, -1)) ```

## Arguments

 `param` The parameter `param` defines the copula through `theta` and `delta`.

## Value

One of the respective BB8 copula classes (BB8Copula, surBB8Copula, r90BB8Copula, r270BB8Copula).

## References

Joe, H., (1997). Multivariate Models and Dependence Concepts. Monogra. Stat. Appl. Probab. 73, London: Chapman and Hall.

See also `BB6Copula()`, `BB7Copula()`, `BB8Copula()` and `joeCopula()` for further wrapper functions to the `VineCopula-package()`.
 ```1 2 3 4 5 6``` ```library(copula) persp(BB8Copula(c(2, 0.9)), dCopula, zlim = c(0, 10)) persp(surBB8Copula(c(2, 0.9)), dCopula, zlim = c(0, 10)) persp(r90BB8Copula(c(-2, -0.9)), dCopula, zlim = c(0, 10)) persp(r270BB8Copula(c(-2, -0.9)), dCopula, zlim = c(0, 10)) ```