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Re: st: power calculation graphs


From   Nikolaos Pandis <npandis@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: power calculation graphs
Date   Fri, 20 Aug 2010 05:21:12 -0700 (PDT)

Dear Roger,

Many thanks, I will look it up.

Best wishes,

Nick

--- On Fri, 8/20/10, Roger Newson <r.newson@imperial.ac.uk> wrote:

> From: Roger Newson <r.newson@imperial.ac.uk>
> Subject: Re: st: power calculation graphs
> To: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
> Date: Friday, August 20, 2010, 2:24 PM
> An alternative to -sampsi- would be
> to use the -powercal- package, 
> downloadable from SSC. The -powercal- package has a .pdf
> manual 
> (distributed as an ancillary file) to explain the methods
> and formulas. 
> See Newson (2004), which you can download from
> http://www.stata-journal.com/article.html?article=st0074
> 
> I hope this helps.
> 
> Best wishes
> 
> Roger
> 
> References
> 
> Newson R. Generalized power calculations for generalized
> linear models 
> and more. The Stata Journal 2004; 4(4): 379-401.
> 
> 
> Roger B Newson BSc MSc DPhil
> Lecturer in Medical Statistics
> Respiratory Epidemiology and Public Health Group
> National Heart and Lung Institute
> Imperial College London
> Royal Brompton Campus
> Room 33, Emmanuel Kaye Building
> 1B Manresa Road
> London SW3 6LR
> UNITED KINGDOM
> Tel: +44 (0)20 7352 8121 ext 3381
> Fax: +44 (0)20 7351 8322
> Email: r.newson@imperial.ac.uk
> Web page: http://www.imperial.ac.uk/nhli/r.newson/
> Departmental Web page:
> http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/
> 
> Opinions expressed are those of the author, not of the
> institution.
> 
> On 20/08/2010 12:06, Neil Shephard wrote:
> > On Fri, Aug 20, 2010 at 11:01 AM, Nikolaos
> Pandis<npandis@yahoo.com> 
> wrote:
> >>
> >> I am aware of the sampsi family of commands, I
> just did not know how to write the do file in order to
> calculate all the different values from the -sampsi- to use
> for the graph.
> >
> > You might benefit from taking a Stata Net Course
> then.
> >
> > I'd start with 101, see http://www.stata.com/netcourse/nc101.html
> >
> > Or some of the resources at UCLA http://www.ats.ucla.edu/stat/stata/
> > as the use of loops is fairly common in programming
> Stata
> >
> > Neil
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