Uniqueness in the method of moments for mixtures of two normal distributions

By studying uniqueness, we show that Pearson's method of moments for mixtures of two normal distributions must be completed. We then invert a second set of moment equations, which is constructed to complete the classical system of moments. We are thus able to stabilize the method. To cite this article: E. Monfrini, C R. Acad. Sci. Paris, Ser. I336 (2003). (C) 2003 Academie des sciences/Editions scientifiques et medicales Elsevier SAS. All rights reserved.