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Re: st: Weights


From   "Sergiy Radyakin" <serjradyakin@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Weights
Date   Wed, 30 Apr 2008 21:20:49 -0400

On 4/30/08, Michael Blasnik <michael.blasnik@verizon.net> wrote:
> ...
> First, Martin should note that SPSS does not have some magical way to hold
> data more compactly than Stata can.  You just need to pick the proper

It depends on the data: SPSS has a compressed file format, which is
more efficient in storing strings, than Stata format. But you are
right that there is no magic in it.

Sergiy Radyakin

> storage types in Stata.  I would guess that there are variables being held
> as doubles or long strings that don't need that much space.  To get the most
> useful advice, you may want to -describe- one of your dataset chunks so that
> we can see where the storage is being used up.
>
> I often work with fairly large datasets (~1 GB) and one suggestion that I
> haven't seen mentioned thus far is to use -recast- with the force option to
> convert doubles to floats when feasible. I find that compress will rarely
> convert a double to a float even though the actual number is stored with far
> less than float precision.  .
>
> Michael Blasnik
>
>
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