It is also called a random walk or a drunken walk. A probabilistic model of movement that is uncertain as to whether to go left or right, like a drunk person staggering around, is the random walk Xn ( n = 0 , 1, 2, ...), which is defined as follows: Let ξn ( n = 1, 2, ...) be independent random variables such that P ( ξn = 1) = p , P ( ξn = -1) = 1 - p , and X0 = a ( a is an integer). Random walks are a special type of Markov sequence, but they have long been studied in connection with gambling problems. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
乱歩または酔歩ともいう。酔っぱらいのふらふら歩きのように,左右どちらに進むか定まらない運動の確率論的モデルがランダムウォークXn(n=0,1,2,……)で,次のように定義される。ξn(n=1,2,……)をP(ξn=1)=p,P(ξn=-1)=1-pとなる独立確率変数とし,X0=a (aは整数),である。ランダムウォークはマルコフ系列の特殊なものであるが,賭の問題とも関連して古くからよく研究されてきた。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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