Thanks Michael and others. I'm working with a dataset of a few thousand
cases and I can't tell any difference whether I preserve or not. But,
suppose you had some monstrous data set - how much time would the
preserve/restore options take? Are we talking 5 seconds here, 5 minutes,
or what?
Here are timings on 325,000 obs and 248 vars.
. des,short
Contains data from c:/statdata/pdox242e/raoafib.dta
obs: 325,102 RAOAFib Table version of 1 Feb
2005
vars: 248 1 Feb 2005 23:42
size: 141,094,268 (31.1% of memory free)
Sorted by:
Note: dataset has changed since last saved
. set rmsg on
r; t=0.00 8:02:40
. preserve
r; t=5.69 8:02:49
. restore
r; t=0.25 8:02:54
So it is 6 seconds on a fast machine and fast disk.
Fred
Fred Wolfe
National Data Bank for Rheumatic Diseases
Wichita, Kansas
Tel (316) 263-2125 Fax (316) 263-0761
[email protected]
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