From thomas@biostat.washington.edu  Fri May 21 19:22:21 1999
From: thomas@biostat.washington.edu (Thomas Lumley)
Date: Fri, 21 May 1999 11:22:21 -0700 (PDT)
Subject: glm crash (PR#197)
In-Reply-To: <199905211804.UAA12871@pubhealth.ku.dk>
Message-ID: <Pine.GSO.4.10.9905211112010.269-100000@wompom.biostat.washington.edu>

On Fri, 21 May 1999 Cor.Berrevoets@gironet.nl wrote:

> Dear bug-busters,
> 
> This week I've posted a message to the R-help mailing to inquire if
> anybody had experienced alike me. When I run the following GLM:
> glm(n~s+c+m, family=quasi(link=log, variance=mu))
> several times using exactly the same dataset R crashes at random. I have
> tried to probe into the problem by tracking the response times of the
> above function with system.time (e.g. system.time(glm ....))

This could be some nasty form of memory problem, but it is difficult to
tell.  With a program as complex as R it is very hard to diagnose bugs
from symptoms like this.

At a minimum we need to know exactly what message R gives, however this
probably isn't enough. An example data set that reliably produces the
problem gives us a chance to track the bug down and at least makes it
easy to distinguish Windows-based bugs from general-purpose bugs.

	-thomas

Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle


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glm crash (PR#197)
Thomas Lumley