Abstract
Given a probability distribution \(\tau \) on a space X, let M=M \(\tau \)denote the random probability measure on X known as Dirichlet random measure with parameter distribution \(\tau \). We prove the formula \(\left\langle {\frac{1}{{1 - z_1 F_1 (M) - ... - z_m F_m (M)}}} \right\rangle = {\text{exp}}\int {{\text{ln}}} \frac{1}{{1 - z_1 f_1 (x) - ... - z_m f_m (x)}}\tau (dx)\) where \(F_k (M) = \int_X {f_k } (x)M(dx)\), the angle brackets denote the average in M, and f 1,...,f m are the coordinates of a map \(f:X \to \mathbb{R}^m \). The formula describes implicitly the joint distribution of the random variables F k (M), k=1,...,m. Assuming that the joint moments \(p_{k_1 ,...,k_m } = \int {f_1^{k_1 } } (x)...f_m^{k_m } (x)d\tau (x)\) are all finite, we restate the above formula as an explicit description of the joint moments of the variables F 1,...,F m in terms of \(p_{k_1 ,...,k_m } \). In the case of a finite space, |X|=N+1, the problem is to describe the image \(\mu \) of a Dirichlet distribution \(\frac{{M_0^{\tau _{0^{ - 1} } } M_1^{\tau _{1^{ - 1} } } ...M_N^{\tau _{N^{ - 1} } } }}{{\Gamma (\tau _0 )\Gamma (\tau _1 )...\Gamma (\tau _N )}}dM_1 ...dM_{N;} {\text{ }}M_0 ,...,M_N \geqslant 0,M_0 + ... + M_N = 1\) on the N-dimensional simplex \(\Delta ^N \) under a linear map \(f:\Delta ^N \to \mathbb{R}^m \). An explicit formula for the density of \(\mu \) was already known in the case of m=1; here we find it in the case of m=N-1. Bibliography: 15 titles.
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REFERENCES
D. M. Cifarelli and E. Regazzini, “Some remarks on the distribution functions of means of a Dirichlet process,” Ann. Statist., 18, 429–442 (1990).
P Diaconis and J. Kemperman, “Some New Tools for Dirichlet Priors,” in: Bayesian Statistics, Vol. 5, J. M. Bernardo, J. O. Berger, A. P. Dawid and A. F. M. Smith (eds.), Oxford University Press (1996), pp. 97–106.
H. Exton, Multiple Hypergeometric Functions and Applications, John Wiley & Sons Inc., New York (1976).
P. D. Feigin and R. L. Tweedie, “Linear functionals and Markov chains associated with Dirichlet process,” Math. Proc. Camb. Phil. Soc., 105, 579–585 (1989).
T. Ferguson, “A Bayesian analysis of some nonparametric problems,” Ann. Statist., 1, 209–230 (1973).
S. Kerov, “Interlacing measures,” Amer. Math. Soc. Transl., 181, 35–83 (1998).
J. F. C. Kingman, Poisson Processes, Clarendon Press, Oxford (1993).
M. G. Krein and A. A. Nudelman, “The Markov moment problem and extremal problems,” Translations of Mathematical Monographs, No. 50, AMS, Providence, Rhode Island (1977).
D. Kulin, “Multidimensional Markov-Krein correspondence,” Diploma Thesis, St. Petersburg State University (2000).
I. Macdonald, Symmetric Functions and Hall Polynomials, Clarendon Press, Oxford (1979).
A. A. Markov, “Nouvelles applications des fractions continues,” Math. Ann., 47, 579-597 (1896).
J. Pitman, “The two-parameter generalization of Ewens' random partition structure,” Tech. Report, 345, 1–23 (1992).
J. Pitman, “Some developments of the Blackwell—MacQueen urn scheme,” in: Statistics, Probability and Game Theory (Monograph Ser.), Vol. 30, Ferguson T. S., Shapley L. S., and MacQueen J. B. (eds.), IMS Lect. Notes, (1996), pp. 245–267.
J. Pitman and M. Yor, “The two-parameter Poisson—Dirichlet distribution derived from a stable subordinator,” Ann. Prob., 25, 855–900 (1997).
N. V. Tsilevich, “Distribution of mean values of some random measures,” Zap. Nauchn. Semin. POMI, 240, 268–279 (1997).
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Kerov, S.V., Tsilevich, N. The Markov–Krein Correspondence in Several Dimensions. Journal of Mathematical Sciences 121, 2345–2359 (2004). https://doi.org/10.1023/B:JOTH.0000024616.50649.89
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DOI: https://doi.org/10.1023/B:JOTH.0000024616.50649.89