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st: graphing a series of vectors (latent growth curve model estimate summaries)


From   "Stephen P. Jenkins" <stephenj@essex.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: graphing a series of vectors (latent growth curve model estimate summaries)
Date   Wed, 29 Oct 2008 11:50:59 -0000

A colleague wishes to summarise her estimates from a latent growth
curve model. I seek tips about how to construct graphs in the format
often used in this context.

In the graphs, the horizontal axis shows age. The vertical axis shows
the predicted n-year trajectory for a latent outcome. Plotted for each
of several starting ages is a vector or arrow -- a straight line
summarising the estimated trajectory going from the start year t to
the end year t+n with an arrowhead at the latter end. So, the graph is
the collection of vectors, and the vectors looked at collectively
themselves indicate a lifecourse trajectory (since number of years
used in each vector is relatively small, and 5-10 vectors may be used
to cover the whole life course).

An example is shown as "Figure 1: Predicted 8-year aging vectors of
physical impairment by educational attainment and family income", in
Jinyoung Kima and Emily Durden, "Socioeconomic status and age
trajectories of health", Social Science & Medicine 65 (2007) 2489-2502
http://www.ncbi.nlm.nih.gov/pubmed/17765375

The substantive medical application is not the essence of my question.
My questions concerns how to draw graphs like this, and related issues
such as data set-up. -graph twoway pccapsym- discussed on [G] p. 259,
and -graph twoway pcspike-, [G] p.268, seem to offer related
facilities but not quite what is requested here.

Stephen
-------------------------------------------------------------
Professor Stephen P. Jenkins <stephenj@essex.ac.uk>
Director, Institute for Social and Economic Research
University of Essex, Colchester CO4 3SQ, U.K.
Tel: +44 1206 873374.  Fax: +44 1206 873151.
http://www.iser.essex.ac.uk  
Survival Analysis using Stata:
http://www.iser.essex.ac.uk/teaching/degree/stephenj/ec968/ 
Downloadable papers and software: http://ideas.repec.org/e/pje7.html

Learn about the UK's new household panel survey, "Understanding
Society": http://www.understandingsociety.org.uk/


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