Try:
use in 1/100 using mydata, clear
______________________________________________
Kieran McCaul MPH PhD
WA Centre for Health & Ageing (M573)
University of Western Australia
Level 6, Ainslie House
48 Murray St
Perth 6000
Phone: (08) 9224-2140
Phone: -61-8-9224-2140
email: [email protected]
http://myprofile.cos.com/mccaul
_______________________________________________
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Rodini, Mark
Sent: Friday, 4 April 2008 7:32 AM
To: [email protected]
Subject: st: using the first n observations in a dataset w/o evaluating
the whole thing?
Greetings.
Suppose I have a large Stata dataset (e.g. 3,000,000 observations) and I
only with to read in the first, say, 100 observations.
I have tried the code, which works:
use mydata if ( _N<100 )
However, evidently, this code goes through ALL 3 million observations to
evaluate the expression in parentheses, which can be very time consuming
(and sort of defeats the purpose). Is there a way to only read the
first 100 observations without having to evaluate the entire dataset?
Perhaps some application of the "set obs 100"? But I have not been
successful.
Thank you.
-Mark
----------------------------------------------
Mark Rodini
[email protected]
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* For searches and help try:
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* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
