Re: [R] interpreting Weibull survival regression

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Mon 27 Jun 2005 - 08:28:04 EST

> Here gamma is the usual gamma function, see ?gamma. (I notice in the R
> documentation of the Weibull distribution that "E(X) = b Gamma(1+1/a)",
> which is an error; the G should be g (lowercase).)

It is not an error. R's function gamma() is said to implement \eqn{\Gamma}{Gamma}: `see ?gamma'!

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Mon Jun 27 08:33:21 2005

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