https://terms-en.ai-term-hub.com/en/tags/evaluation-metrics/Recent content in Evaluation Metrics on English AI Terms DictionaryHugoen-usSat, 18 Jul 2026 11:44:44 +0000https://terms-en.ai-term-hub.com/en/terms/phi_coefficient/Sat, 18 Jul 2026 10:10:59 +0000https://terms-en.ai-term-hub.com/en/terms/phi_coefficient/<h2 id="definition">Definition</h2> <p>The Phi coefficient (φ) is a measure of association for two binary variables, serving as the Pearson correlation coefficient for dichotomous variables. It ranges from -1 to +1, where 0 indicates no association, +1 indicates perfect positive association, and -1 indicates perfect negative association. It is widely used in contingency table analysis to determine the strength of the relationship between two categorical features, particularly in classification tasks involving binary outcomes.</p>