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ITSPOWER: Stata module for simulation based power calculations for linear interrupted time series (ITS) designs

Author

Listed:
  • Evangelos Kontopantelis

    (University of Manchester)

Programming Language

Stata

Abstract

itspower is a simulations-based command that calculates power for linear interrupted time series (ITS) designs. The command proceeds in two steps. First, it generates the outcome data according to the specified inputs and then uses linear regression modelling (defining panel data with xtset and analysing the time-series using xtreg) to estimate the power for the model to detect the specified level change. Level change is defined as the increase above (or decrease below) the expected overall mean, for the time-point following the intervention. Power indicates the percentage of iterations in which the level change was found to be statistically significant and of the same direction as the hypothesised. The 95% confidence interval (as default), or any other confidence interval as specified by option clvl(#), for the power is also reported.

Suggested Citation

  • Evangelos Kontopantelis, 2018. "ITSPOWER: Stata module for simulation based power calculations for linear interrupted time series (ITS) designs," Statistical Software Components S458492, Boston College Department of Economics.
    • Handle: RePEc:boc:bocode:s458492
    Note: This module should be installed from within Stata by typing "ssc install itspower". 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/i/itspower.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/i/itspower.sthlp
    File Function: help file
    Download Restriction: no
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