On 20 DFómh 2009, at 18:47, Ursula Dallinger wrote:
I tried the command contract, wasn't succesfull with expand, than
closed Stata completely and assumed that I can open my original
dta-file agan. However, there wa sonly a version of yesterday. All my
changes of today's session which I saved several times , where gone.
What happened, and how can I get the toadys data-file.?
It is never good practice to work 'live on air' on your data file.
Keep an original datafile, and accumulate commands in a do-file which
build the working datafile - generating new variables, dropping cases
etc.
That way, when things go wrong, you can use the do-file to rebuild
your working data file.
One important reason for doing this is because you need to leave an
audit trail showing how you created your working datafile. It also is
important because you can review the code in the do-file to make sure
that you did exactly what you thought you did.
Ronan Conroy
=================================
[email protected]
Royal College of Surgeons in Ireland
Epidemiology Department,
Beaux Lane House, Dublin 2, Ireland
+353 (0)1 402 2431
+353 (0)87 799 97 95
+353 (0)1 402 2764 (Fax - remember them?)
http://rcsi.academia.edu/RonanConroy
P Before printing, think about the environment
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