One must sometimes follow the evolution of several individuals that cannot be distinguished. The author proposes a graphical estimator of individual evolution that can be used in such cases. She shows that this estimator is consistent and asymptotically normal. RÉSUMÉ On doit parfois suivre l'évolution d'individus impossiblesà différencier. L'auteure propose ici une estimation graphique d'évolution individuelle valable dans de telles situations. Elle montre que l'estimation obtenue est convergente et asymptotiquement normale.
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