XGROUP: Stata module to create a grouping variable with key values in an output dataset
Abstractxgroup 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.
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Bibliographic InfoSoftware component provided by Boston College Department of Economics in its series Statistical Software Components with number S456956.
Programming language: Stata
Requires: Stata version 10.0
Date of creation: 26 Jan 2009
Date of revision: 04 Feb 2009
Note: This module should be installed from within Stata by typing "ssc install xgroup". Windows users should not attempt to download these files with a web browser.
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Postal: Boston College, 140 Commonwealth Avenue, Chestnut Hill MA 02467 USA
Web page: http://fmwww.bc.edu/EC/
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