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RE: RE: st: A bug in egen and gen?
From
"Liao, Junlin" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
RE: RE: st: A bug in egen and gen?
Date
Fri, 18 Feb 2011 16:41:18 +0000
Maarten,
Out of curiosity, do you know the maximum difference that the -recast- procedure allows to recast a variable from double to float?
Junlin
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Maarten buis
Sent: Friday, February 18, 2011 10:31 AM
To: [email protected]
Subject: RE: RE: st: A bug in egen and gen?
--- On Fri, 18/2/11, Liao, Junlin wrote:
> You may have most of the variables in decimal and double could very
> well inflate your dataset to double its size. But I doubt the majority
> of Stata users are not in that camp.
My guess would have been that the majority does have most variables as non-integers, but if there is one thing I have learned from the Statalist is that the way Stata is used and the kind of problems people run into is far more heterogenous than I could have ever dreamed of, so I am not willing to call this anymore than a guess.
> The -compress- command missing opportunity to reduce double to float
> can be easily demonstrated.
>
> . set type double
>
> . clear
>
> . gen a=4.1
<snip>
If you really believe that your data is so precisely measured that it needs to be entered as doubles, than you should not convert double 4.1 to float 4.1; they are not the same number:
. di %21x 4.1
+1.0666666666666X+002
. di %21x float(4.1)
+1.0666660000000X+002
-- Maarten
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
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