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st: Average age at first occurrence analysis

From   Andrew John Brunskill <>
Subject   st: Average age at first occurrence analysis
Date   Wed, 11 Feb 2009 16:46:58 -0800 (PST)

Please would any kind people suggest some stata commands that would allow me to calculate estimated average times , using Weibull type models, with particular emphasis on their use in case only designs. The only reference in the stata list I can find is on the shared frailty model but most of the sources I can find are on the Cox (proportional hazards) model. There was a very valuable paper by Boshuizen HC and Greenland S Int J Epidemiology 1997 26 4 867 �erage age at first occurrence as an alternative occurrence parameter�hich �couraged the development of suitable packaged software allowing the fitting of these models�and an excellent but scary paper by Wilk JB and Lash TL Emerging Themes in Epidemiology 2007 4:1 �sk factors studies of age-at-onset..:a cautionary tale�which shows the methodological and interpretative problems. Prof Greenland has been kind enough to clarify for me what I need to understand. What I would love to get as a reasonably numerate medical epidemiologist ( but not someone who models bus waiting times in greek numerals in my head (alas!) )is a good book or source (lecture notes??) with some worked commands in hopefully stata. My work is on data on kidney failure and transplant so it might even be helpful to some other people sometime! Thanks very much for any replies. Andrew Brunskill

Andrew J Brunskill,
University of Washington
Fellow in Epidemiology ANZDATA

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