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Re: st: svy regress Stata 9 vs Stata 8
At 10:06 AM 8/9/2005 -0500, Jeff Pitblado, StataCorp LP wrote:
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.
There are two reasons for the difference in speed between -svyregress- and
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.
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
WWW (personal): http://www.nd.edu/~rwilliam
WWW (department): http://www.nd.edu/~soc
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