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From |
Steven Samuels <sjhsamuels@earthlink.net> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Average age at first occurrence analysis |

Date |
Thu, 12 Feb 2009 13:34:26 -0500 |

Andrew, Andrew:

The two articles you referred to are both available online. http://ete-online.com/content/4/1/1 Wilk and Lash

Best, Steve On Feb 11, 2009, at 7:46 PM, Andrew John Brunskill wrote:

Please would any kind people suggest some stata commands that wouldallow me to calculate estimated average times , using Weibull typemodels, with particular emphasis on their use in case only designs.The only reference in the stata list I can find is on the sharedfrailty model but most of the sources I can find are on the Cox(proportional hazards) model. There was a very valuable paper byBoshuizen HC and Greenland S Int J Epidemiology 1997 26 4 867âAverage age at first occurrence as an alternative occurrenceparameterâ which âencouraged the development of suitable packagedsoftware allowing the fitting of these modelsâ and an excellentbut scary paper by Wilk JB and Lash TL Emerging Themes inEpidemiology 2007 4:1 âRisk factors studies of age-at-onset..:acautionary taleâ which shows the methodological and interpretativeproblems. Prof Greenland has been kind enough to clarify for mewhat I need to understand. What I would love to get as areasonably numerate medical epidemiologist ( but not someone whomodels bus waiting times in greek numerals in my head (alas!) )is agood book or source (lecture notes??) with some worked commands inhopefully stata. My work is on data on kidney failure andtransplant so it might even be helpful to some other peoplesometime! Thanks very much for any replies. Andrew Brunskillandrew@anzdata.org.auAndrew J Brunskill, University of Washington jaberwok@u.washington.edu Fellow in Epidemiology ANZDATA andrew@anzdata.org.au

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**References**:**st: Average age at first occurrence analysis***From:*Andrew John Brunskill <jaberwok@u.washington.edu>

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