[R] leaps: XHAUST returned error code -999

[Thomas Lumley]

On Mon, 25 Oct 1999, Pete St. Onge wrote:

> Hi there,
>      This problem has been dogging me for a bit, and I'm trying to
> figure out why. When running the the subsets function in the leaps
> library, R is giving me the following error message
> 
> > lvodsub <- subsets(pred, resp$LVOD)
> Warning message: 
> XHAUST returned error code -999 in: leaps.exhaustive(a, really.big =
> really.big) 

This turned out to be a design matrix with five out of twenty very nearly
redundant columns. subsets() tries to predict whether it will run across a
singularity at some point, but its prediction wasn't sufficiently
paranoid.

The problem should be very rare, but I will soon be releasing a version
of the package that does glms (approximately) and I'll adjust
the singularity tolerance then.


Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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