IOTA: Stata module to compute the iota coefficient of interrater agreement for interval or nominal multivariate observations

Ariel Linden

Statistical Software Components from Boston College Department of Economics

Abstract: iota computes the iota coefficient of interrater agreement proposed by Janson and Olsson (2001). This measure of agreement is an extension of Cohen's (1960) kappa for univariate (single depvar) nominal data and Berry and Mielke's (1988) generalization of Cohen's kappa agreement measure to univariate (single depvar) interval level data to the multivariate case. As described by Janson and Olsson (2001), their proposed extension of Cohen's agreement measure is applicable to interobserver agreement in the case where a set of two or more judges (sampled from a larger population of possible judges) have rated a set of targets (sampled from a larger population of targets) on several dimensions or variables. The basic assumptions are that targets are independent and that judges have operated independently. When there are two judges and one variable, iota is exactly equivalent to Cohen's (1960) kappa. And when there is one variable and several judges, iota exactly equals Berry and Mielke's (1988) R and also Conger's (1980) "Fleiss exact" coefficient — a modification of a measure originally proposed by Fleiss (1971).

Language: Stata
Requires: Stata version 12
Keywords: iota coefficient; interrater agreement; interrater reliability; Cohen’s kappa; intraclass coefficient; multivariate (search for similar items in EconPapers)
Date: 2023-07-15
Note: This module should be installed from within Stata by typing "ssc install iota". 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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Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/i/iota.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/i/iota.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/i/iota_nominal.dta supplementary data file (application/x-stata)
http://fmwww.bc.edu/repec/bocode/i/iota_interval.dta supplementary data file (application/x-stata)

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