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From |
Steven Samuels <sjsamuels@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Landmark analysis |

Date |
Thu, 3 Feb 2011 22:54:21 -0500 |

On Feb 3, 2011, at 6:08 PM, Sripal Kumar wrote: Thanks Steve and thank you for clarifying the correct spelling. I would have used STATA going along with the rest of the programs assuming that it is an acronym. I wonder what stata means.

Steve sjsamuels@gmail.com

You must -stset- your data. Then -sts graph , hazard- will estimatethehazard function over the entire range of the data; you can add aline forthe time of your landmark event and annotate it. See -help- for "added_line_options" and "added_text_options". -stcox- and the contributed program -stpm2- ("findit") handle allow time-dependent covariates. With them you can test equality of hazardfunctions before and after any event. If the times of your landmarkeventare not constant, you can get graphs in -stcox- and -stpm2- bycreatingtime-dependent strata: one pre-event, one post-event. To createthese youcould, for example, -stsplit- the data at the time of the event.Note that "STATA" is not a correct spelling of "Stata" (StatalistFAQ 8.4).Names all in upper case are acronyms, names whose letters are letters(usually the first) of words in the original, sometimes abandoned,name. Soin statistics: "SAS" = "Statistical Analysis System"; "SPSS" ="StatisticalPackage for the Social Sciences"; "SUDAAN"= "SUrvey DAta ANalysis"."Stata" is not such a word; its letters never stood for anythingelse.Steve sjsamuels@gmail.com On Feb 1, 2011, at 7:58 PM, Sripal Kumar wrote: Dear all, I am interested in doing a landmark surival analysis- an analysis where you compare treatment effect before and after a certain landmark. For example, I am interested in constructing a hazard plot for two treaments from start of treament to 30 days and then from 30 days to end of follow-up in the same plot. Is there a way to do this in STATA. thanks, Sripal. * * 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/ * * 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: Landmark analysis***From:*Sripal Kumar <sripalkumar@gmail.com>

**Re: st: Landmark analysis***From:*Steven Samuels <sjsamuels@gmail.com>

**Re: st: Landmark analysis***From:*Sripal Kumar <sripalkumar@gmail.com>

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