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Re: st: Landmark analysis
From
Sripal Kumar <[email protected]>
To
[email protected]
Subject
Re: st: Landmark analysis
Date
Thu, 3 Feb 2011 18:08:14 -0500
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.
On Thu, Feb 3, 2011 at 10:54 AM, Steven Samuels <[email protected]> wrote:
> You must -stset- your data. Then -sts graph , hazard- will estimate the
> hazard function over the entire range of the data; you can add a line for
> the 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 hazard
> functions before and after any event. If the times of your landmark event
> are not constant, you can get graphs in -stcox- and -stpm2- by creating
> time-dependent strata: one pre-event, one post-event. To create these you
> could, for example, -stsplit- the data at the time of the event.
>
>
> Note that "STATA" is not a correct spelling of "Stata" (Statalist FAQ 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. So
> in statistics: "SAS" = "Statistical Analysis System"; "SPSS" = "Statistical
> Package for the Social Sciences"; "SUDAAN"= "SUrvey DAta ANalysis".
> "Stata" is not such a word; its letters never stood for anything else.
>
> Steve
> [email protected]
>
> 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.
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