RE: st: A bug in egen and gen?

["Liao, Junlin" <junlin-liao@uiowa.edu>]

I'm confused here now. Isn't the type of variables determines storage spaces? I'll do some experiments to see your point here. Your attention and quick responses are greatly appreciated.

Junlin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Thursday, February 17, 2011 1:23 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: A bug in egen and gen?

You're saying, in effect, that nearly doubling storage would not typically bite users. That will be true in some cases but not all.

There is no need to wonder. The help for -save- says there is no such option. But -compress- before -save- is naturally a very good choice and you could program your own wrapper for -save- that always did it.

Here is a sketch:

program jlsave
version 8
compress
save `0'
end

But if you do what you just said you wanted to do, -set type double-, using -compress- is not going to give you back more than a fraction of the extra storage you spend. The fraction will depend on how much you deal with strings, always integer variables, etc.

On Thu, Feb 17, 2011 at 7:11 PM, Liao, Junlin <junlin-liao@uiowa.edu> wrote:

Storage wouldn't be a problem if we perform -compress- command regularly. I'm wondering if Stata can let you select an option whenever it saves data, it compresses. It will surely be handy to solve this problem.

Nick Cox

> In practice, if StataCorp always warned you of everything that could bite you, the help would be much, much longer.
>
> Your last suggestion would typically leave -double-s in place unless it so happened that the result was integers in every observation. To see why, study Bill Gould's recent postings on the StataCorp blog.
> That would on average nearly double your storage. If you don't mind, you might as follow Stas' suggestion and -set type double-.
>
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