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

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

Subject |
st: R: survival analysis |

Date |
Wed, 24 Sep 2008 09:21:20 +0200 |

Dear Moleps: -----Original message----- Da: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di moleps islon Inviato: marted́ 23 settembre 2008 21.51 A: statalist@hsphsun2.harvard.edu Oggetto: st: survival analysis Hello, I've got several questions where I would greatly appreciate feedback 1) Reading the medical literature most retrospective survival analysis is done with Kaplan Meier curves. Is it not more appropriate to use cox graphs where other covariates have been adjusted for? 1_answer)The main concern regarding semiparametric Cox proportional hazards model (and the related regression) is the holding of the proportional hazards statement throughout the follow-up. This statement is violated whenever the survival curves are not parallel (please, see - help stphplot - and -help stcoxkm - in Stata 9.2; I do not know the analogous commands in Stata 10.1). Cleves MA, Gould WW, Gutierrez RG. An Introduction to survival analysis using Stata.2nd ed. College Station: Stata Press, 2006 offers a thorough covering of this and related topics. Moreover, 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 the topics you are interested in. 2) Some report both univariate and then multivariate data on their variables. What is the correct thing to do? 2_answer)The wisest (but not that supporting) answer would probably be: it depends on the data you can rely on and the aim(s) of your research project. 3)I'm unable to make my individual graphs in stata v10.1 appear with diamonds, triangles and squares instead of the multitude of colors. I can change the line pattern, but I cant find a way to report the lines with diamons etc. Surely this must be possible-But despite several days of working on this I cant manage.. 3-answer) When compared to other Stata routine, which are really quick and easy to learn, I find the graphic side of the matter particularly user-demanding; however, please see - [G] graph intro - in Stata manual. 4) is there an option to make a table that I can put beneath the graph delineating the number of patients in the different groups at different timepoints? 4_answer) In Stata 9.2 this option is provided by the following: SJ-4-4 st0058_2 . . . . . . . . . . . . . . . Software update for stsatrisk . . . . . . . . . . . . J. M. Linhart, J. S. Pitblado, and J. Hassell (help stsatrisk if installed) Q4/04 SJ 4(4):491 bug fix for stsatrisk.ado If I recall it correctly, Stata 10.1 has an ad hoc in-built command for this option. HTH and Kind Regards, Carlo Regards Moleps * * 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: survival analysis***From:*"moleps islon" <moleps2@gmail.com>

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