Distribution and quantile precision (was [R] Underflow warnings?)

[Jim Lindsey]

> 
> On Mon, 14 Feb 2000, John Logsdon wrote:
> > 
> > On Sun, 13 Feb 2000, Thomas Lumley wrote:
> > 
> > > 
> > > A bigger issue, which we _have_ been working on, is getting closer to full 
> > > precision for the probability and quantile functions. 
> > >  
> > Ah - will this include functions for the logs of densities and quantiles?
> 
> 
> Yes: eg from the pre1.0.0 help page for pchisq()
> 
> Usage:
> 
>      dchisq(x, df, ncp=0, log = FALSE)
>      pchisq(q, df, ncp=0, lower.tail = TRUE, log.p = FALSE)
>      qchisq(p, df, ncp=0, lower.tail = TRUE, log.p = FALSE)
>      rchisq(n, df)
> 
> 
> so we at least have syntax for log densities and log probabilities and
> for lower as well as upper tail probabilities. I don't know if all the
> underlying functions have been updated or only some of them.

Unless errors have crept in, everything is working. Jim


> 
> 	-thomas
> 
> Thomas Lumley
> Assistant Professor, Biostatistics
> University of Washington, Seattle
> 
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