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Re: st: RE: Growth curve with -gllamm- (any way to get peak velocityand height?)
From |
Joseph Wagner <[email protected]> |
To |
[email protected] |
Subject |
Re: st: RE: Growth curve with -gllamm- (any way to get peak velocityand height?) |
Date |
Fri, 10 Aug 2007 09:38:13 -0400 |
The research involves craniofacial skeletal growth measurements. The
data consist of several angle measurements at junctions between bones
and length measurements of specific areas of bone. We have demographic
data as well. We get measurements (using x-rays) from individuals
annually over their lifetime. We want to know at which point the
greatest rate of growth occurs and the peak growth velocity for
individuals and the mean for our entire sample. We also want to know
the rate of bone recession in older persons.
Nick Cox wrote:
It isn't obvious from this information alone that -gllamm-
is the only or even the best way to do it. That said,
there will be ways to get key properties of fitted
growth curves, even if only numerically. Quite how
will depend on what you do precisely, so better answers
might depend on further information.
Nick
[email protected]
Joseph Wagner
I have data composed of yearly jaw xray measurements over a 20 year
period. I wish to do some growth curve analyses of these
data so I plan
to use -gllamm- but I was wondering, is there a way to get
the mean peak
velocity and the mean peak height of the growth curve?
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--
Joseph H. Wagner, M.P.H.
Lifespan Health Research Center
Wright State University Boonshoft School of Medicine
3171 Research Blvd.
Kettering, OH 45420-4014
(937) 775-1494 (LHRC office)
(937) 775-1456 (fax)
[email protected]
Visit the Lifespan Health Research Center Home Page at:
http://www.med.wright.edu/lhrc
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