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MARK_CHANGES: Stata module to generate a variable indicating where one or more variables changes value


  • David Kantor



A program to detect changes -- or the starts of spells of same-valued observations with respect to a given varlist. While the basic idea is simple, the capacity for a varlist and the use of -by- make it particularly useful.

Suggested Citation

  • David Kantor, 2009. "MARK_CHANGES: Stata module to generate a variable indicating where one or more variables changes value," Statistical Software Components S457030, Boston College Department of Economics.
  • Handle: RePEc:boc:bocode:s457030
    Note: This module should be installed from within Stata by typing "ssc install mark_changes". Windows users should not attempt to download these files with a web browser.

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    spell; spells; change; changes; duplicate; duplicates;


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