Description Usage Arguments Value Author(s) References Examples

Computes the pdf, cdf, value at risk and expected shortfall for the Burr distribution due to Burr (1942) given by

*\begin{array}{ll}
&\displaystyle
f (x) = \frac {b a^b}{x^{b + 1}} ≤ft[ 1 + ≤ft( x / a \right)^{-b} \right]^{-2},
\\
&\displaystyle
F (x) = \frac {1}{1 + ≤ft( x / a \right)^{-b}},
\\
&\displaystyle
{\rm VaR}_p (X) = a p^{1 / b} (1 - p)^{-1 / b},
\\
&\displaystyle
{\rm ES}_p (X) = \frac {a}{p} B_p ≤ft( 1 / b + 1, 1 - 1 / b \right)
\end{array}*

for *x > 0*, *0 < p < 1*, *a > 0*, the scale parameter, and *b > 0*, the shape parameter,
where *B_x (a, b) = \int_0^x t^{a - 1} (1 - t)^{b - 1} dt* denotes the incomplete beta function.

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`x` |
scaler or vector of values at which the pdf or cdf needs to be computed |

`p` |
scaler or vector of values at which the value at risk or expected shortfall needs to be computed |

`a` |
the value of the scale parameter, must be positive, the default is 1 |

`b` |
the value of the shape parameter, must be positive, the default is 1 |

`log` |
if TRUE then log(pdf) are returned |

`log.p` |
if TRUE then log(cdf) are returned and quantiles are computed for exp(p) |

`lower.tail` |
if FALSE then 1-cdf are returned and quantiles are computed for 1-p |

An object of the same length as `x`

, giving the pdf or cdf values computed at `x`

or an object of the same length as `p`

, giving the values at risk or expected shortfall computed at `p`

.

Saralees Nadarajah

S. Nadarajah, S. Chan and E. Afuecheta, An R Package for value at risk and expected shortfall, submitted

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