REPEATABILITY: Stata module to compute the repeatability coefficient

Ariel Linden

Statistical Software Components from Boston College Department of Economics

Abstract: repeatability computes the repeatability coefficient (RC) which has been described as the "consistency of quantitative results obtained when the same imaging test is performed at short intervals on the same subjects or test objects using the same equipment in the same center" (Barnhart & Barboriak 2009), or interpreted as the "smallest detectable difference between a test and retest measurement for a given subject, defined as a 100(1−α/2)% quantile of the distribution of test-retest differences" (Baumgartner et. al. 2018). More specifically, the interpretation of RC is that the difference between any two readings on the same subject is expected to be from −RC to RC for 95% (or whatever level is specified) of subjects (Barnhart & Barboriak 2009; Bland & Altman 1996). repeatability computes confidence intervals based on the chi2 method described by Barnhart & Barboriak (2009), but I recommend using the bootstrap as shown in the example below.

Language: Stata
Requires: Stata version 11
Keywords: repeatability coefficient; quantitative data; interrater agreement; interrater reliability (search for similar items in EconPapers)
Date: 2023-08-20
Note: This module should be installed from within Stata by typing "ssc install repeatability". 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/r/repeatability.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/r/repeatability.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/l/lungfunction.dta supplementary data file (application/x-stata)

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