Re: st: Landmark analysis

[Steven Samuels <sjsamuels@gmail.com>]

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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