Can't you do that like this?
*------------ begin example -----------
tempfile a b
sysuse auto, clear
gen key = uniform()
preserve
drop make
save `a'
restore
keep make key
sort key
save `b'
use `a', clear
sort key
merge key using `b'
*----------- end example ------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )
So what you give others is a dataset with a key that is a
random draw from a uniform distribution, and if you need the
data you wanted to hide you can merge that data back in by
using that key.
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of Hendri Adriaens
Sent: woensdag 13 juni 2007 17:00
To: [email protected]
Subject: RE: st: RE: RE: Encryption of data
Dear David,
> We sociologists (and others) make a distinction between
> anonymity and
> confidentiality. To make a dataset anonymous, it would seem
> you need
> to remove the variable that has the names.
Thanks for your concern, but it doesn't involve names, these are removed
anyway. I need the variable to link the data to other datasets. But it's
enough to encrypt the variable in a one-way manner. I can do that for both
datasets, get anonymity and am able to link. I cannot link and then destroy
the variable, we will need it later.
Best regards,
-Hendri.
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