RE: covariates
From: "Leonid Gibiansky" leonidg@metrumrg.com
Subject: RE: [NMusers] covariates
Date: Mon, September 20, 2004 5:28 am
Renee,
Something in not correct with the implementation of the first approach. You
can try to re-run it with the initial values of the power parameters equal
to the ones from the allometric scaling (0.75, -0.25 or 1). Then you should
have the same results as for the allometric model to better (in terms of
OF). If you start from the small values (around zero) then you should have
results as good as for the base model or better.
Meanwhile, I rerun my latest project following Nick suggestion (with
allometric scaling on all parameters). It gave slightly higher OF (15 points
for FOCE) and similar CVs as my model with LBW on 3 parameters. The fit was
good, and I think by adding BMI or something similar I should be able to
improve it further. So I benefited from this discussion as well, thanks,
Nick
Leonid