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.
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Publisher Info
Software component provided by Boston College Department of Economics in its series Statistical Software Components with number
S449503.
Size: Programming language: Stata Requires: Stata version 7 Date of creation: 24 Mar 2005 Date of revision:
12 Mar 2008 Handle: RePEc:boc:bocode:s449503
Note: This module may be installed from within Stata by typing "ssc install optifact". Windows users should not attempt to download these files with a web browser. Contact details of provider: Postal: Boston College, 140 Commonwealth Avenue, Chestnut Hill MA 02467 USA Phone: 617-552-3670 Fax: +1-617-552-2308 Email: Web page: http://fmwww.bc.edu/EC/ More information through EDIRC