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From |
Edgar Munoz <munozedg@hotmail.com> |

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

Subject |
Re: st: Predicting survival at some specific times |

Date |
Sun, 7 Aug 2011 00:55:05 -0500 |

... you have to use the outfile option to save the plot data to a .dta file On Aug 7, 2011, at 12:48 AM, Edgar Munoz <munozedg@hotmail.com> wrote: > After stcox you can also use survci to obtain pointwise confidence intervals for the covariate-adjusted survivor fn or cum hazard fn > > Edgar Munoz > Statistician > IHPR @ UTHSCSA > > > > On Aug 6, 2011, at 10:22 PM, Steven Samuels <sjsamuels@gmail.com> wrote: > >> On Aug 5, 2011, at 12:06 PM, nakhtardanesh@cogeco.ca wrote: >> >>> Hello, >>> I would appreciate if someone could kindly let me know how to predict survival (probability) at some specific times for >>> each subject after using streg and stcox commands. For instance, how can I predict 2-year survival after using streg >>> (stcox) on a group patients with breast cancer? >> >> >> Here is code inspired by Bobby Gutierrez's post at http://www.stata.com/statalist/archive/2010-12/msg00647.html. The -stcox- prediction assumes that you have observations at the time you want to predict for. To create and name predictions for several times, you'll need to use -foreach- loops. >> >> Steve >> >> *************CODE BEGINS************* >> /* streg with prediction at t = 20 */ >> scalar tt = 20 >> sysuse cancer, clear >> gen id =_n >> streg age, dist(weibull) >> gen t_old = _t >> replace _t=tt >> predict s1, surv >> label var s1 "streg prediction" >> replace _t = t_old >> >> /* stcox, assumes an observation at t= 20! */ >> >> stcox age >> predict xb, xb >> predict s, basesurv >> gen stt = s if t==tt >> sum stt, meanonly >> replace stt = r(mean) >> gen s2 = stt^exp(xb) >> label var s2 "stcox prediction" >> sort age >> di "Survival computed at t = " tt >> list age id s1 s2 >> **************CODE ENDS************** >> >> >> * >> * 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/ > * * 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/

**Follow-Ups**:**Re: st: Predicting survival at some specific times***From:*Steven Samuels <sjsamuels@gmail.com>

**References**:**st: Predicting survival at some specific times***From:*nakhtardanesh@cogeco.ca

**Re: st: Predicting survival at some specific times***From:*Steven Samuels <sjsamuels@gmail.com>

**Re: st: Predicting survival at some specific times***From:*Edgar Munoz <munozedg@hotmail.com>

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