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e.m. algorithm

Symposium - International Astronomical Union (1)

International Astronomical Union (1)

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Comparing Parametric and Nonparametric Statistical Methods for Studying the Velocity Distributions of Population I Stars
F. Arenou, M. L. Bougeard
Journal:

Symposium - International Astronomical Union / Volume 156 / 1993

Published online by Cambridge University Press:

07 August 2017, pp. 265-269

Print publication:

1993
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This Paper investigates population I star samples from the viewpoint of the velocity distributions, each being viewed as a mixture. To obtain information on the class centers, clustering techniques are first applied. Secondly, we use a parametric maximum likelihood formulation that we solve by Redner-Walker's E.M. algorithm. The obtained results are compared and discussed from an astrophysical viewpoint.