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OPTIFACT: Stata module to find the best summated rating scale from a list of items

Author

Listed:
  • Paul Millar

    (University of Calgary)

Programming Language

Stata

Abstract

optifact is a program to find the combination of items that makes the best summated rating scale. Each possible combination of items is called a candidate scale. optifact uses common factor analysis on every candidate scale, does canonical correlation (if requested) on each of the candidate scales, and sorts the candidate scales which have only one dimension in descending order of Cronbach's alpha, for each size of scale. The alphas are not compared across scale sizes, since alpha usually increases with the addition of an item, even if that item does not significantly add to the measurement.

Suggested Citation

  • Paul Millar, 2005. "OPTIFACT: Stata module to find the best summated rating scale from a list of items," Statistical Software Components S449503, Boston College Department of Economics, revised 14 Apr 2011.
    • Handle: RePEc:boc:bocode:s449503
    Note: This module should be installed from within Stata by typing "ssc install optifact". 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/o/optifact.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/o/optifact.hlp
    File Function: help file
    Download Restriction: no
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    Citations

    Blog mentions

    As found by EconAcademics.org, the blog aggregator for Economics research:
    1. Creating Summated Scales
      by Ethan Fosse in Culture, Statistics, and Society on 2009-12-15 01:43:00

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