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POWERCAL: Stata module to perform general power and sample size calculations

Author

Listed:
  • Roger Newson

    (National Heart and Lung Institute, Imperial College London)

Programming Language

Stata

Abstract

powercal performs general power and sample size calculations, storing the result in a new variable. powercal can calculate any one of the number of sampling units, power, alpha (significance level), delta (difference in parameter value to be detected), or the standard deviation (SD) of the influence function. (The SD of the influence function is defined as the expected standard error of the sample difference multiplied by the number of sampling units.) Any of these 5 quantities can be calculated from the other 4. -powercal takes, as input, expressions delivering variables containing the 4 input quantities, and creates, as output, a variable containing the output quantity. These variables can then be plotted against each other, giving colleagues a view, at a glance, of the trade-offs involved.

Suggested Citation

  • Roger Newson, 2001. "POWERCAL: Stata module to perform general power and sample size calculations," Statistical Software Components S422401, Boston College Department of Economics, revised 31 Mar 2012.
    • Handle: RePEc:boc:bocode:s422401
    Note: This module may be installed from within Stata by typing "ssc install powercal". 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/p/powercal.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/p/powercal.sthlp
    File Function: help file
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/p/powercal.pdf
    File Function: manual
    Download Restriction: no
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    More about this item

    Keywords

    power; sample size; Stata;
    All these keywords.

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