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Liquefaction potential index (LPI) is commonly used for liquefaction risk assessment. Although several LPI classifications have been proposed, those classifications are categorical and descriptive, which are not useful for quantitative risk assessments (risk = probability × consequence). In this study, a total of 135 soil liquefaction data points from Taiwan, Turkey, and Italy were collected and used for developing a new empirical relationship between LPI and liquefaction probability with logistic regression. In addition, we conducted 10 additional sensitivity analyses to evaluate the possible impact of random data arrangement on this study, showing that the impact was very insignificant given the similar results obtained from the analyses. [ABSTRACT FROM AUTHOR]