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

Paul Millar

Statistical Software Components from Boston College Department of Economics

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.

Language: Stata
Requires: Stata version 7
Keywords: rating; scale; common factor; Cronbach alpha (search for similar items in EconPapers)
Date: 2005-03-24, Revised 2011-04-14
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.
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http://fmwww.bc.edu/repec/bocode/o/optifact.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/o/optifact.hlp help file (text/plain)

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