Description Usage Arguments Details Value Author(s) Examples

Generic function to find the quantiles of a distribution, given the equivalent probability distribution function.

1 |

`pdist` |
Probability distribution function,
for example, |

`p` |
Vector of probabilities to find the quantiles for. |

`special` |
Vector of character strings naming arguments of the
distribution function that should not be vectorised over. Used, for
example, for the |

`...` |
The remaining arguments define parameters of the
distribution This may also contain the standard arguments If the distribution is bounded above or below, then this should contain
arguments |

This function is intended to enable users to define `"q"`

functions for
new distributions, in cases where the distribution function `pdist`

is
available analytically, but the quantile function is not.

It works by finding the root of the equation *h(q) = pdist(q) - p = 0*.
Starting from the interval *(-1, 1)*, the interval width
is expanded by 50% until *h()* is of opposite sign at either end.
The root is then found using `uniroot`

.

This assumes a suitably smooth, continuous distribution.

An identical function is provided in the flexsurv package.

Vector of quantiles of the distribution at `p`

.

Christopher Jackson <[email protected]>

1 2 |

msm documentation built on Feb. 3, 2018, 1:04 a.m.

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