COLLAPSE2: Stata module to extend the collapse command

David Roodman

Statistical Software Components from Boston College Department of Economics

Abstract: collapse2 is an extension of Stata's built-in collapse command, which converts the data in memory into a dataset of means, sums, medians, etc. It differs only in offering four additional "aggregation" operators: first, last, firstnm, and lastnm. These are useful, for example, if you want to create a cross-section data set from annual data, with initial population as a variable. You must first tsset your data to use these additional operators.

Language: Stata
Requires: Stata version 8.0
Keywords: collapse; data manipulation (search for similar items in EconPapers)
Date: 2004-08-03, Revised 2004-08-04
Note: This module should be installed from within Stata by typing "ssc install collapse2". 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.
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http://fmwww.bc.edu/repec/bocode/c/collapse2.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/c/collapse2.hlp help file (text/plain)

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