Mixtures of Gamma Distributions With Applications
Mixtures of Gamma Distributions With Applications
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DOI:
10.1198/106186001317115054
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发表时间:
2001-09
影响因子:
2.4
通讯作者:
M. Wiper;D. Insua;F. Ruggeri
中科院分区:
文献类型:
--
作者:
M. Wiper;D. Insua;F. Ruggeri
This article proposes a Bayesian density estimation method based upon mixtures of gamma distributions. It considers both the cases of known mixture size, using a Gibbs sampling scheme with a Metropolis step, and unknown mixture size, using a reversible jump technique that allows us to move from one mixture size to another. We illustrate our methods using a number of simulated datasets, generated from distributions covering a wide range of cases: single distributions, mixtures of distributions with equal means and different variances, mixtures of distributions with different means and small variances and, finally, a distribution contaminated by low-weighted distributions with different means and equal, small variances. An application to estimation of some quantities for a M/G/1 queue is given, using real E-mail data from CNR-IAMI.