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XGROUP: Stata module to create a grouping variable with key values in an output dataset

Author

Listed:
  • Roger Newson

    (King's College London)

Programming Language

Stata

Abstract

xgroup is an extended version of the egen function group(varlist). It inputs a varlist of existing variables, and generates as output a new variable, defining a grouping of the observations by the varlist, and also an output dataset (or resultsset), with 1 observation per non-missing value of the new output variable, and data on the values of the input variables corresponding to that value of the output variable. The output dataset is sorted primarily by the new grouping variable, and secondarily by the variables in the varlist, allowing the output dataset to be merged into other datasets, using the official Stata command merge or the SSC package addinby. xgroup is typically used together with the SSC packages parmest and factext when a multiple-intercept model is fitted to the data, with 1 intercept for each combination of values for the varlist.

Suggested Citation

  • Roger Newson, 2009. "XGROUP: Stata module to create a grouping variable with key values in an output dataset," Statistical Software Components S456956, Boston College Department of Economics, revised 04 Feb 2009.
    • Handle: RePEc:boc:bocode:s456996
    Note: This module should be installed from within Stata by typing "ssc install xgroup". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
    as

    Download full text from publisher

    File URL: http://fmwww.bc.edu/repec/bocode/x/xgroup.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/x/xgroup.sthlp
    File Function: help file
    Download Restriction: no
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