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From |
"Stephen P. Jenkins" <[email protected]> |

To |
<[email protected]> |

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 <[email protected]> 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/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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