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From |
Maarten buis <maartenbuis@yahoo.co.uk> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Draw graph after stpiece |

Date |
Tue, 6 May 2008 17:25:09 +0100 (BST) |

--- Thong Pham <T.Pham@rug.nl> wrote: > Does anybody show me how to draw a hazard, survival function after > running stpiece command to estimate a piecewise constant > exponential model. -stpiece- is a user writen program, I assume you the version from -ssc- (there are sometimes multiple versions of user written software floating around in cyberspace). Consider the example below: -stpiece- requires a you -stset- your data using an id variable, which is absent in the cancer dataset, so I create one with the -gen long id = _n- command. In order to use postestimation commands you need to specify the -nopreserve- option in -stpiece-. The hazard is e to the power of the linear predictor, so the -adjust- commands with the -exp- option allows you to compute the predicted hazard when for the control group (_Idrug_2==0 and _Idrug_3==0) with a mean age. Next you graph the result: *----------- begin example ---------------------- sysuse cancer, clear gen long id = _n stset studytime, failure(died) id(id) xi: stpiece i.drug age, tp(5 10 20 30) nopreserve adjust _Idrug_2=0 _Idrug_3=0 age, exp by(studytime) gen(hazard) twoway line hazard studytime, sort c(J) *----------- end example ------------------------ (For more on how to use examples I sent to the Statalist, see http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html ) Hope this helps, Maarten ----------------------------------------- Maarten L. Buis Department of Social Research Methodology Vrije Universiteit Amsterdam Boelelaan 1081 1081 HV Amsterdam The Netherlands visiting address: Buitenveldertselaan 3 (Metropolitan), room Z434 +31 20 5986715 http://home.fsw.vu.nl/m.buis/ ----------------------------------------- ___________________________________________________________ Yahoo! For Good. Give and get cool things for free, reduce waste and help our planet. Plus find hidden Yahoo! treasure http://green.yahoo.com/uk/earth-day/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Draw graph after stpiece***From:*"Thong Pham" <T.Pham@rug.nl>

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