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Re: st: n-way tabulation


From   Lawrence Hanser <lhanser@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: n-way tabulation
Date   Wed, 2 Nov 2005 16:22:08 -0800

Thanks, xcontract worked perfectly.

Now I have an additional question.  My dataset of cell frequencies
(created by xcontract) has something like 140,000 observations.  My
original dataset has 648,000 observations.  I need to attach the cell
frequencies back to the original dataset.  I thought this would be
something like  -merge, but it wants unique observations...

Imagine something like this in the original data:

religion  race    gender
  1          1           1
  1          1           1
  1          1           2
  1          2           1
  1          2           1

the data created by -xcontract are:

religion  race    gender  _freq
  1          1           1         2
  1          1           2         1
  1          2           1         2

I want my original dataset to be:

religion  race    gender  _freq
  1          1           1        2
  1          1           1        2
  1          1           2        1
  1          2           1        2
  1          2           1        2

I tried -merge ....., uniqusing
where my frequency dataset was the using dataset, but it was still
looking for unique values of the -merge varlist in the master dataset.

Thanks,

Larry








On 11/1/05, Roger Newson <roger.newson@kcl.ac.uk> wrote:
> Another possibility might be to use -xcontract- (downloadable from SSC),
> which abbreviates Joseph's solution, as in
>
> xcontract religion gender age ethnicity, list(, noobs separator(0))
>
> The -xcontract- package can also produce an output dataset (or resultsset)
> containing the table cells for future use, as in
>
> xcontract religion gender age ethnicity, saving(mycells1, replace)
>
> which creates a Stata dataset (or resultsset) in -mycells1.dta- with 1
> observation per table cell. This resultsset can then be processed in any
> way the user likes, to produce plots and tables.
>
> I hope this helps.
>
> Roger
>
>
> At 13:48 01/11/2005, Bill Gould wrote:
> >Lawrence Hanser <lhanser@gmail.com> asked
> >
> > > Is it possible to do greater than two-way cross-tabulations?  For
> > > example, if I have religion (10 categories), gender (2 categories),
> > > age (4 categories), and ethnicity (6 categories), is there a simple
> > > command to get the counts for each of the 480 cells?
> >
> >Joseph Coveney <jcoveney@bigplanet.com> suggested
> >
> >         . preserve
> >         . contract religion gender age ethnicity
> >         . list, noobs separator(0)
> >         . restore
> >
> >Anotehr possibility is
> >
> >         . table age ethnicity gender, by(religion)
> >
> >-table- produces tabular output, which Lawrence may prefer.  -table-, however,
> >does not generalize beyond 4-way tables, as Joseph's solution does.
>
>
> --
> Roger Newson
> Lecturer in Medical Statistics
> Department of Public Health Sciences
> Division of Asthma, Allergy and Lung Biology
> King's College London
>
> 5th Floor, Capital House
> 42 Weston Street
> London SE1 3QD
> United Kingdom
>
> Tel: 020 7848 6648 International +44 20 7848 6648
> Fax: 020 7848 6620 International +44 20 7848 6620
>    or 020 7848 6605 International +44 20 7848 6605
> Email: roger.newson@kcl.ac.uk
> Website: http://phs.kcl.ac.uk/rogernewson/
>
> Opinions expressed are those of the author, not the institution.
>
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