st: New versions of -xcontract- and -xcollapse- on SSC

[Roger Newson <roger.newson@kcl.ac.uk>]

Fellow Statalisters

Thanks to Kit Baum, new versions of the -xcontract- and -xcollapse- 
packages are now available on SSC. In Stata, type -ssc desc xcontract- and 
-ssc desc xcollapse- to find out more.

The -xcontract- and -xcollapse- packages are described as below on my 
website. They are extended versions of -contract- and -collapse-, 
respectively, and allow the user to specify the destination of the output 
data set, which may be listed to the Stata log, saved to a disk file, or 
written to memory (overwriting the pre-existing data set). -xcontract- also 
calculates percentages (within by-groups if specified). The new versions 
are improved by having -by()- options instead of being byable using -by 
varlist :-, so the user does not have to sort the data before calling 
-xcontract- and -xcollapse-, or sort them back into the original order 
afterwards. (Sorry for any inconvenience caused because I didn't get this 
feature right first time.)

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: 10august2003
      Stata-Version: 8

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

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

TITLE
      xcollapse: Make data set of summary statistics on disk or in memory

DESCRIPTION/AUTHOR(S)
      xcollapse is an extended version of collapse, which 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 summary statistics of 
other
      variables (eg means) in each combination. xcollapse allows the user 
to choose
      the destination of the output data set, which 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: 10august2003
      Stata-Version: 8

INSTALLATION FILES                                  (click here to install)
      xcollapse.ado
      xcollapse.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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