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From |
"Carlo Lazzaro" <carlo.lazzaro@tiscalinet.it> |

To |
<statalist@hsphsun2.harvard.edu> |

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

Date |
Thu, 12 Feb 2009 10:27:16 +0100 |

Dear Andrew, never heard about this topic of Survival Analysis (SA) before. Thanks for pointing this out. I suppose that you have already collected each and every existing reference; anyway, googling for Weibull distribution I have found what below: http://en.wikipedia.org/wiki/Weibull distribution http://en.wikipedia.org/wiki/Survival_analysis David Collett. Modelling Survival Data in Medical Research, Second Edition. Boca Raton: Chapman & Hall/CRC. 2003. Regina Elandt-Johnson and Norman Johnson. Survival Models and Data Analysis. New York: John Wiley & Sons. 1980/1999. Jerald F. Lawless. Statistical Models and Methods for Lifetime Data, 2nd edition. John Wiley and Sons, Hoboken. 2003. Terry Therneau. "A Package for Survival Analysis in S". http://www.mayo.edu/hsr/people/therneau/survival.ps, at: http://mayoresearch.mayo.edu/mayo/research/biostat/therneau.cfm "Engineering Statistics Handbook", NIST/SEMATEK SOCR Survival analysis applet and interactive learning activity. For further details on SA, I will recommend you to take a thorough look at: Cleves MA, Gould WG, Gutierrez R. An Introduction To Survival Analysis Using Stata. Revised edition. College Station: StataPress, 2006; [ST] Stata manual. Survival analysis and epidemiological table. Release 9 Two other relevant contributors of the Statalist - Maarten Buis (http://home.fsw.vu.nl/m.buis/) and Stephen Jenkins (http://www.iser.essex.ac.uk/teaching/degree/stephenj/ec968/index.php.) published really interesting papers as well as teaching-notes on SA topics. Sorry I cannot be more helpful. Kind Regards, Carlo -----Messaggio originale----- Da: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Andrew John Brunskill Inviato: giovedì 12 febbraio 2009 1.47 A: statalist@hsphsun2.harvard.edu Cc: jaberwok@u.washington.edu Oggetto: st: Average age at first occurrence analysis 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 Average age at first occurrence as an alternative occurrence parameter which encouraged 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 Risk 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@anzdata.org.au Andrew J Brunskill, University of Washington jaberwok@u.washington.edu Fellow in Epidemiology ANZDATA andrew@anzdata.org.au * * 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/ * * 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/

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

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