At 04:07 PM 4/13/2005 +0100, Nick Cox wrote:
Some very good rules there Nick. I'd be curious what thoughts people have
about this one:
The package -stylerules- on SSC has been
updated. I started by making a few changes
in the light of Stata 9, but mostly thought
of some other things to mention while
I was doing that.
"Avoid preserve if possible. preserve is attractive to the programmer but
can be expensive in time for the user with large data files. Programmers
should learn to master marksample."
Suppose I ignore that advise and instead do something like
keep if `touse'
1. Will I gain some speed, because Stata will be working with a smaller
data set and won't have to repeatedly process -if `touse'- commands?