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Re: st: Landmark analysis


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.

You are welcome, Sripal. The FAQ state that "Stata is an invented word." Obviously, the "Stat" part is from "statistics". Mathematica and Statistica come to mind as programs with similarly invented names.

Steve
sjsamuels@gmail.com


On Thu, Feb 3, 2011 at 10:54 AM, Steven Samuels <sjsamuels@gmail.com> 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
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.
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