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From |
"maartenbuis@yahoo.co.uk" <maartenbuis@yahoo.co.uk> |

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

Subject |
Re: st: Draw graph after stpiece |

Date |
Tue, 6 May 2008 11:01:22 -0700 |

--- 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/ Privileged, confidential or patient identifiable information may be contained in this message. This information is meant only for the use of the intended recipients. If you are not the intended recipient, or if the message has been addressed to you in error, do not read, disclose, reproduce, distribute, disseminate or otherwise use this transmission. Instead, please notify the sender by reply e-mail, and then destroy all copies of the message and any attachments. * * 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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