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ECOLLAPSE: Stata module to extend collapse to string variables

Author

Listed:
  • Diego Ciccia

    (Economics Department, Sciences Po)

Programming Language

Stata

Abstract

This package extends base Stata collapse to summarize string variables by group. Two methods are supported so far: (concat) Observations of varlist within the same by level are stacked together. The user can set the concatenation order with sorted() option. (union) Distinct values of varlist within the same by level are stacked together. This collapse option is optimized via bitmasking. As a result, this method is only feasible for string variables with at most 25 different values. Any other argument of collapse (e.g. (max), (mean), (firstnm), ...) can be specified within ecollapse. Differently from traditional collapse, variable labels are preserved after collapsing.

Suggested Citation

  • Diego Ciccia, 2024. "ECOLLAPSE: Stata module to extend collapse to string variables," Statistical Software Components S459357, Boston College Department of Economics.
    • Handle: RePEc:boc:bocode:s459357
    Note: This module should be installed from within Stata by typing "ssc install ecollapse". 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/e/ecollapse.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/e/ecollapse.sthlp
    File Function: help file
    Download Restriction: no
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