within-subject stdized regression w missing data

One thing I've got to do is make sure that each subject's
regression will actually run, or omit the ones that won't, or
else the whole thing bombs.  I have been unable to get lm() to
proceed without doing this with several extra steps.  (I did read
the help page.)

This part can be easily solved. Use try() as a wrapper around your lm().
It captures errors and returns an object of class "try-error" instead of
crashing.

	-thomas

Thomas Lumley			Asst. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle

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