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Re: st: Is it normal that -svytab- works slowly?


From   Nick Winter <nwinter@virginia.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Is it normal that -svytab- works slowly?
Date   Tue, 07 Oct 2008 12:19:55 -0400

-tabulate- with aweights will give the same point estimates (frequencies, proportions, etc.) as -svy: tab-. You only need the latter if you are interested in standard errors, significance calculations, and so forth.

-Nick Winter

Steven Samuels wrote:

For checking on errors or weird values in the data set, -tabulate- is the proper command.

-Steve


On Oct 7, 2008, at 11:32 AM, Man Jia wrote:

Hi all,

I was wondering if anyone could give me some suggestion on command
-svytab-.

My goal is to get the frequencies distribution of most of the variables
in a survey  data set (with sampling weight). I don't choose -tabulate-
because it can't be used together with pweight.
So, I generate a constant variable which equals 1 and -svytab each
variable I'm interested with in the data set together with the constant
variable 1.

The problem is that, it takes about 5 minutes to do just one svytab .
After svytab for 4 variables, stata shows there's not enough memory to
do svytab to the rest variables,although the memory has already been
set to 1g. (The data set has 3,932,343 observations and 90 variables.)

So, my questions are as follows.
(1) Is it normal that -svytab- need so much memory and it works so
slowly ?
(2) Is there any better way to check frequencies of a lot of variables
with sampling weight?
(3) Suppose the goal of checking frequencies is just to see  if there's
anything weird or any errors in the data. Is there any problem if I
just use -tabulate- and put the weight variable  as aweight or fweight
instead of pweight?

Thanks a lot for your help!

Mandy
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--
--------------------------------------------------------------
Nicholas Winter                                 434.924.6994 t
Assistant Professor                             434.924.3359 f
Department of Politics                  nwinter@virginia.edu e
University of Virginia          faculty.virginia.edu/nwinter w
PO Box 400787, 100 Cabell Hall
Charlottesville, VA 22904

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