Re: R-beta: Small problems with R0.49

Kurt Hornik (
Wed, 30 Apr 1997 10:20:22 +0200

Date: Wed, 30 Apr 1997 10:20:22 +0200
Message-Id: <>
From: Kurt Hornik <>
To: Jim Lindsey <>
Subject: Re: R-beta: Small problems with R0.49
In-Reply-To: <>

>>>>> Jim Lindsey writes:

> Suggestions:
> 1. d, p, q, and r functions for inverse Gauss and Laplace
> distributions.
> 2. Add a fifth function for continuous distributions, the hazard
> function, h. For example, ht <- function(...) dt(...)/(1-pt(...))
> is the Student t hazard function.
> For writing likelihood functions, these would be much faster in C than
> R and some such as Weibull can be simplified.
> 3. Add the five functions for three parameter distributions such as
> generalized F, extreme value, etc., Box-Cox,... (I have the densities,
> cumulative, and hazard as R functions.)
> 4. Philippe Lambert and I have d and p functions working in R for the
> four-parameter stable family by inverting the characteristic function
> with a Fourier transform (requires C code). S-plus only has the r
> function for stables.

It would definitely be wonderful to have all these functions available.
I am a bit worried about over-polluting the name space, though.  (I was
never too happy with pf and their likes.)

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