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A new urn model

Published online by Cambridge University Press:  14 July 2016

May-Ru Chen*
Affiliation:
National Changhua University of Education
Ching-Zong Wei*
Affiliation:
Academia Sinica, Taiwan
*
Postal address: Department of Mathematics, National Changhua University of Education, 1 Jin-De Road, Changhua, 500, Taiwan, Republic of China. Email address: [email protected]
∗∗Postal address: Institute of Statistical Science, Academia Sinica, 128 Academia Road, Sec. 2, Taipei, 115, Taiwan, Republic of China. Email address: [email protected]
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Abstract

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In this paper, we propose a new urn model. A single urn contains b black balls and w white balls. For each observation, we randomly draw m balls and note their colors, say k black balls and mk white balls. We return the drawn balls to the urn with an additional ck black balls and c(mk) white balls. We repeat this procedure n times and denote by Xn the fraction of black balls after the nth draw. To investigate the asymptotic properties of Xn, we first perform some computational studies. We then show that {Xn} forms a martingale, which converges almost surely to a random variable X. The distribution of X is then shown to be absolutely continuous.

Type
Research Papers
Copyright
© Applied Probability Trust 2005 

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