Re: Significance?
From: LSheiner
Subject: Re: [NMusers] Significance?
Date: Wed, 03 Apr 2002 11:23:18 -0800
Quite the contrary. In my experience, the obj function is far more sensitive to
differences in goodness of fit than the graphics.
I will often find a marginal increment in goodness of fit
(say <=10 points) with some modeling change, but
be unable to find any picture that looks "better."
I do not accept such changes.
In contrast, I cannot recall any case
in which I could see a clear signal in a picture, which I could not then
confirm by making the indicated model change and finding that the obj
function changed markedly -- Except where I had made some kind of
modeling or coding error!
I would definitely not let siuch a thing pass without
a very thorough investigation.
LBS
--
_/ _/ _/_/ _/_/_/ _/_/_/ Professor Lewis B Sheiner, MD
_/ _/ _/ _/_ _/_/ mail: Box 0626, UCSF, SF, CA,94143
_/ _/ _/ _/ _/ courier: Rm C255, UCSF, SF, CA,94122
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