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ALPHAPLOT: Stata module to plot Cronbach's alpha for increasing subsets of a variable list

Author

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  • Ariel Linden

    (Linden Consulting Group, LLC)

Programming Language

Abstract

alphaplot produces a plot of Cronbach's alpha coefficients for increasing subsets of items (k) in the varlist ranging from 2 to k. The variables specified in varlist should represent the items loaded onto a factor, ordered by their loading values from high to low. alphaplot is a useful tool to visualize the diminishing returns of reliability with an increasing number of items loaded on a factor. However, alphaplot is not a substitute for content expertise, and it is possible that a different subset of items may represent the construct better than that based on sequential loading values alone.

Suggested Citation

  • Ariel Linden, 2025. "ALPHAPLOT: Stata module to plot Cronbach's alpha for increasing subsets of a variable list," Statistical Software Components S459533, Boston College Department of Economics.
    • Handle: RePEc:boc:bocode:s459533
    Note: This module should be installed from within Stata by typing "ssc install alphaplot". 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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    File URL: http://fmwww.bc.edu/repec/bocode/a/alphaplot.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/a/alphaplot.sthlp
    File Function: help file
    Download Restriction: no
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