Quantile for betabin function

Standard qbetabinomial.ab function which is missing from the VGAM package.

1 | ```
qbetabinom.ab(p, size, shape1, shape2)
``` |

`p` |
Mean value of the beta-binomial distribution. |

`size` |
Size of the beta-binomial. |

`shape1` |
First parameter of the beta distribution for p. |

`shape2` |
Second parameter of the beta distribution for p. |

A quantile of the distribution.

`VGAM`

package.

Questions? Problems? Suggestions? Tweet to @rdrrHQ or email at ian@mutexlabs.com.

Please suggest features or report bugs with the GitHub issue tracker.

All documentation is copyright its authors; we didn't write any of that.