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This article shows that we can re-write several demographic models for cohort projections as transpositions of the econometric vector auto-regression (VAR) model. In so doing, we give the method of cohort projection a stochastic framework that extends its applicability. This is demonstrated via an example involving the projection of school enrollments. We emphasize a series of equations that allow us to check the validity of several modeling choices that are otherwise made on the basis of habit alone.

Application de l’analyse des séries chronologiques à la projection d’effectifs de population scolaire par la méthode des composantes