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

[Nick Winter <nwinter@virginia.edu>]

-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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>
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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
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*
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