By Pierre Brémaud

The emphasis during this ebook is put on normal versions (Markov chains, random fields, random graphs), common equipment (the probabilistic procedure, the coupling technique, the Stein-Chen approach, martingale equipment, the tactic of sorts) and flexible instruments (Chernoff's certain, Hoeffding's inequality, Holley's inequality) whose area of software extends a ways past the current textual content. even supposing the examples taken care of within the booklet relate to the prospective purposes, within the verbal exchange and computing sciences, in operations examine and in physics, this e-book is within the first example fascinated with concept.

the extent of the ebook is that of a starting graduate path. it truly is self-contained, the necessities consisting simply of uncomplicated calculus (series) and easy linear algebra (matrices). The reader isn't really assumed to study in chance because the first chapters supply in massive element the historical past essential to comprehend the remainder of the book.

**Read Online or Download Discrete Probability Models and Methods: Probability on Graphs and Trees, Markov Chains and Random Fields, Entropy and Coding PDF**

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**Example text**

Each liar transmits what he hears with probability p ∈ (0, 1) and the contrary with probability q = 1 − p. The decision of lying or not is made independently by each liar. What is the probability xn of obtaining the correct information from Ln ? What is the limit of xn as n increases to inﬁnity? 10. The campus library complaint You are looking for a book in the campus libraries. 25. If there are 3 libraries, what are your chances of obtaining the book? 11. Professor Nebulous Professor Nebulous travels from Los Angeles to Paris with stopovers in New York and London.

10 for instance. 2. GENERATING FUNCTIONS 45 sum X + Y is a Poisson random variable with mean α + β. 5 since gX+Y is the gf of a Poisson random variable with mean α + β. The next result gives concerns the shape of the generating function restricted to the interval [0, 1]. 8 (α) Let g : [0, 1] → be deﬁned by g(x) = E[xX ], where X is a non-negative integer-valued random variable. Then g is nondecreasing and convex. Moreover, if P (X = 0) < 1, it is strictly increasing, and if P (X ≤ 1) < 1, it is strictly convex.

9}. We shall compute the generating function of Y = 27 + X1 + X2 + X3 − X4 − X5 − X6 and use the result CHAPTER 2. RANDOM VARIABLES 48 to obtain the probability that in a 6-digit lottery the sum of the ﬁrst three digits equals the sum of the last three digits. We have E[z Xi ] = 1 1 1 − z 10 (1 + z + · · · + z 9 ) = , 10 10 1 − z and therefore E[z −Xi ] = 1 1 1 − z 10 , 10 z 9 1 − z and 3 i=1 E[z Y ] = E[ z 27+ 6 i=4 Xi − Xi 6 3 = E z 27 i=1 6 3 z −Xi = z 27 z Xi i=1 i=4 E[z −Xi ] . E[z Xi ] Therefore, i=4 6 gY (z) = 1 (1 − z 10 ) .