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st: New version of -xcontract- on SSC


From   Roger Newson <roger.newson@kcl.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: New version of -xcontract- on SSC
Date   Thu, 06 Nov 2003 13:18:20 +0000

Fellow Statalisters

Thanks to Kit Baum, there is now a new version of the -xcontract- package downloadable from SSC. In Stata, type -ssc desc xcontract- to find out more.

The -xcontract- package is described as below on my website. The new version fixes a feature, inherited from -contract-, which caused it to fail if the name of the generated frequency variable (which defaults to _freq) was the same as the name of any variable in the existing input data set. The new version only fails if the name of the generated frequency variable clashes with a variable in the output data set (as specified in the -varlist- or the -by()- option). The user can therefore easily use a -xcontract- output data set as input to further -xcontract- commands, as in

sysuse auto, clear
xcontract rep78, by(foreign) norestore list(*)
xcontract foreign [fwei=_freq], list(*)
xcontract rep78 [fwei=_freq], list(*)

Best wishes

Roger

-------------------------------------------------------------------------------------
package xcontract from http://www.kcl-phs.org.uk/rogernewson/stata8
-------------------------------------------------------------------------------------

TITLE
xcontract: Make data set of frequencies and percents on disk or in memory

DESCRIPTION/AUTHOR(S)
xcontract is an extended version of contract. It creates a data set with one
observation per combination of values of a list of variables in the existing
data set and new variables containing the frequency and percent of each
combination, and, optionally, the cumulative frequency and percent of each
combination. A list of by-variables can be used with xcontract, and the
percents will then be calculated within by-groups. The output data set may
either be listed to the Stata log, or saved to a disk file, or written to the
memory (overwriting any existing data set).

Author: Roger Newson
Distribution-Date: 04november2003
Stata-Version: 8

INSTALLATION FILES (click here to install)
xcontract.ado
xcontract.hlp
-------------------------------------------------------------------------------------

--
Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
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://www.kcl-phs.org.uk/rogernewson

Opinions expressed are those of the author, not the institution.

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