Re: st: RE: Growth curve with -gllamm- (any way to get peak velocityand height?)

[Joseph Wagner <joseph.wagner@wright.edu>]

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 
> n.j.cox@durham.ac.uk 
> 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)

joseph.wagner@wright.edu

Visit the Lifespan Health Research Center Home Page at:
http://www.med.wright.edu/lhrc 
*
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