© 2019 Associazione Geotecnica Italiana, Rome, Italy. To provide a quantitative assessment of prediction techniques for liquefaction, we performed multiple centrifuge model tests on the seismic behavior of liquefiable sloping ground, targeting a unique prototype, as well as effective stress analyses for each test result. In comparison of experimental and/or analysis results, uncertainty quantification framework was introduced to estimate the variations and validate the computational model: an error measure called EARTH, in which a total error is given as a sum of phase, magnitude, and slope errors, was used to quantify discrepancy between time histories of experimental or analysis results. By directly comparing the time histories using the error measure, the variation in numerical simulations was assessed in a quantitative manner, as well as that in centrifuge experiments; this suggests that the validity of computational techniques can be evaluated in an objective way by considering both experimental and analytical variations.