Paul R. Yarnold
Optimal Data Analysis, LLC
An exact, optimal (“maximum-accuracy”) psychometric methodology for assessing inter-method reliability for measures involving ordinal ratings is used to evaluate and compare two emergency medicine triage algorithms—both of which classify patients into one of five ordinal categories. Ten raters independently evaluated the identical set of 200 patients, five with each algorithm. UniODA revealed moderate levels of inter-method agreement, which is theoretically consistent with recent findings of moderate inter-observer reliability for triage ratings derived using both algorithms.