Transcription of Chapter 1 Markov Chains - Yale University
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Chapter 1 Markov ChainsA sequence of random variablesX0,X1,..with values in a countable setSisa Markov chain if at any timen, the future states (or values)Xn+1,Xn+2,..depend on the historyX0,..,Xnonly through the present are fundamental stochastic processes that have many diverse applica-tions. This is because a Markov chain represents any dynamical system whosestates satisfy the recursionXn=f(Xn 1,Yn),n 1, whereY1, and identically distributed ( ) andfis a deterministic func-tion. That is, the new stateXnis simply a function of the last state andan auxiliary random variable. Such system dynamics are typical of those forqueue lengths in call centers, stresses on materials, waiting times in produc-tion and service facilities, inventories in supply Chains , parallel-processingsoftware, water levels in dams, insurance funds, stock prices, Chapter begins by describing the basic structure of a Markov chainand how its single-step transition probabilities determine its evolution.
Gambler’s Ruin. Consider a Markov chain on S= ... In this case, the outcome of the game depends on the Gambler’s fortune. When the fortune is i, the Gambler either wins or loses $1 with respective probabilities p i or q i, or breaks even (the fortune does not change) with probability r i. Another interpretation is that the state of the ...
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