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Re: st: svy regress Stata 9 vs Stata 8


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: svy regress Stata 9 vs Stata 8
Date   Tue, 09 Aug 2005 10:44:30 -0500

At 10:06 AM 8/9/2005 -0500, Jeff Pitblado, StataCorp LP wrote:
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.
Thanks for the explanation Jeff. Still, speed differences of 6:1, like Robert found, are not trivial. Hopefully Stata can do something to address that, perhaps either by going back to C code or speeding up Mata. Any one who doesn't need Stata 9's new features (which are very impressive) may wish to use Stata 8.2 version control when doing svy analysis.


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Richard Williams, Notre Dame Dept of Sociology
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