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Re: st: Survey related questions


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Survey related questions
Date   Thu, 08 Sep 2005 06:42:32 -0500

At 03:42 AM 9/8/2005, Thamana Lekprichakul wrote:
the second question is more for the Stata staff.  i noticed that the
svy: tab command in version 9.0 takes significantly much longer time
to present results.  why does Stata 9.0 regress in term of speed in
this particular routine?  how can i speed up estimation process in
svy: tab.
Jeff Pitblado offered this discussion of speed issues back on Aug. 9:

There are two reasons for the difference in speed between -svyregress- and
-svy: regress-.

1.  Compiled code written in C is faster than Mata, although compiled Mata
    code is very fast compared to interpreted Stata code.

2.  General purpose code tends to be slower than code written to take
    advantage of a special case.
If possible with your data, you can use the older & faster svy commands by using version control.

-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
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