: Often cited alongside Theriault, Binder focuses more on "legislative gridlock," but her data on how political bitterness prevents policy-making is considered a "best-in-class" companion write-up to the Index of Acrimony. Vocabulary.com What the Index Measures
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The measurement of negative sentiment—particularly acrimony—remains underdeveloped in both psychology and economics. This paper introduces the as a novel composite metric designed to quantify the intensity of bitterness, resentment, and conflict within dyads, small groups, or online communities. We define "best" as the optimal calibration of the IoA for predictive validity and cross-contextual reliability. Through a mixed-methods approach (surveys, text analysis, and behavioral observation), we derive a 10-item index. Validation against divorce rates, team productivity losses, and social media toxicity suggests that an IoA score above 0.67 (on a 0–1 scale) reliably predicts imminent breakdown. We conclude by offering a "best-practice" IoA formula and discuss its limitations. index of acrimony best
Index Score: 89/100