Re: st: Saved Results by Group

[Roger Newson <roger.newson@kcl.ac.uk>]

At 16:25 06/08/02 -0400, Dan Pregibon wrote:
> Dear Statalisters,
>
> Suppose I am summarizing survival data with the command "stsum, by(group)" 
> and would like to store particular results of each group in a new variable 
> I have generated.  The stored result "r(p50)", for example, will give me 
> the 50th percentile of the total set.  Is there a stored result for the 
> 50th percentile of just group 1 or group 2?
No, there isn't. You need to use the -statsby- command of official Stata to 
store the results of an analysis for multiple by-groups in a data set with 
1 observation per by-group. See -help statsby- online or -[R] statsby- in 
the manuals.

If you are doing analyses with by-groups using estimation commands such as 
-stcox-, rather than r-class commands such as -sumby-, you can use either 
-statsby- (to generate a data set with 1 observation per by-group) or 
-parmby- (to generate a data set with 1 observation per parameter per 
by-group and data on confidence limits, P-values and other things). 
-parmby- is part of the -parmest- package, which you can download from SSC. 
Type -ssc describe parmest- in Web-aware Stata to find out more.

I hope this helps.

Roger


--
Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
King's College London
5th Floor, Capital House
42 Weston Street
London SE1 3QD
United Kingdom

Tel: 020 7848 6648 International +44 20 7848 6648
Fax: 020 7848 6620 International +44 20 7848 6620
  or 020 7848 6605 International +44 20 7848 6605
Email: roger.newson@kcl.ac.uk

Opinions expressed are those of the author, not the institution.

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/