ITSAPERM: Stata module to perform permutation tests for matched multiple group interrupted time series analysis

Ariel Linden

Statistical Software Components from Boston College Department of Economics

Abstract: itsaperm performs a robustness check in the form of permutation tests to assess whether the treatment effect (identified in a multiple group interrupted time series analysis with matched sets), remains plausible under a pseudo-treatment assignment process. itsaperm iteratively casts each unit into the role of “treated”, creating a comparable control group from other units in the sample using itsamatch, and then evaluates treatment effects using itsa. The specific treatment effect evaluated is the differences-in-differences in trends (see Remarks section below). The results of the permutation tests are presented in a forest plot. If statistically significant “treatment effects” are estimated for pseudo-treated units, then any significant changes in the outcome of the true treatment unit cannot be attributed to the intervention.

Language: Stata
Requires: Stata version 11
Keywords: interrupted time series; quasi-experimental studies; causal inference; permutation tests (search for similar items in EconPapers)
Date: 2018-05-05, Revised 2024-05-02
Note: This module should be installed from within Stata by typing "ssc install itsaperm". 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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Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/i/itsaperm.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/i/itsaperm.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/i/itsamatch.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/i/itsamatch.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/i/itsa.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/i/itsa.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/g/glm2.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/c/cigsales.dta sample data file (application/x-stata)
http://fmwww.bc.edu/repec/bocode/c/cigsales_single.dta

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