glm crash (PR#197)

Thomas Lumley
Fri, 21 May 1999 11:22:21 -0700 (PDT)

On Fri, 21 May 1999 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 Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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