DELTA: Stata module to compute the Delta index of scale discrimination

Jean-Benoit Hardouin ()

Statistical Software Components from Boston College Department of Economics

Abstract: delta computes the generalized delta index of scale discrimination developed by Hankins (2007) based on the original work of Ferguson (1949). This index measures the scale's ability to distinguish between individuals. A value of 1 indicates that the test has maximal discrimination (all possible scores occur with the same frequency) and a value of 0 means that the test has minimal discrimination (all the respondents have the same score). A value of 0.9 results from a set of scores that is normally distributed. A value of 1 is observed if the scores follow a uniform distribution. Individuals with a missing score are omitted.

Language: Stata
Requires: Stata version 7
Keywords: delta index; psychometrics; Cronbach alpha; discrimination (search for similar items in EconPapers)
Date: 2007-06-23, Revised 2008-03-12
Note: This module may be installed from within Stata by typing "ssc install delta". Windows users should not attempt to download these files with a web browser.

Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/d/delta.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/d/delta.hlp help file (text/plain)

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Persistent link: http://EconPapers.repec.org/RePEc:boc:bocode:s456851

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