A method and a system for standardizing data used for monitoring an aeroengine, and including: operating over time to collect time-series measurements from the aeroengine; calculating from the time-series measurements a set of indicators Y=(y1, . . . , yj, . . . , ym) specific to elements of the engine; identifying from the time-series measurements an exogenous data set X=(x1, . . . , xn) representative of external context acting on the set of indicators Y; defining a conditional multidimensional model simultaneously handling the indicators of the set of indicators Y while taking account of the exogenous data set X to form a set of estimators Ŷ=(ŷ1, . . . , ŷj, . . . , ŷm) corresponding to the set of indicators Y=(y1, . . . , yj, . . . , ym); and normalizing each estimator ŷj as a function of a reference value for the corresponding indicator yj and of a difference between each estimator ŷj and corresponding indicator yj so as to form a set of standardized values {tilde over (Y)}=({tilde over (y)}1, . . . , {tilde over (y)}j, . . . , {tilde over (y)}m).