| 释义 |
random walk
random walkn. Statistics A sequence of changes, either in the value of a random variable or in a process (as in the price of a share of stock), in which the direction and size of each change is randomly determined, subject to some specified rules.random walk n 1. (General Physics) a mathematical model used to describe physical processes, such as diffusion, in which a particle moves in straight-line steps of constant length but random direction 2. (Statistics) statistics a route consisting of successive and connected steps in which each step is chosen by a random mechanism uninfluenced by any previous step ran′dom walk′
n. the path of a point or quantity that moves or changes in a stepwise manner, where the direction of each step is statistically random. [1900–05] Thesaurus| Noun | 1. | random walk - a stochastic process consisting of a sequence of changes each of whose characteristics (as magnitude or direction) is determined by chancestochastic process - a statistical process involving a number of random variables depending on a variable parameter (which is usually time) |
Translations
random walk
random walk[′ran·dəm ′wȯk] (mathematics) A succession of movements along line segments where the direction and possibly the length of each move is randomly determined. random walk
Random walkTheory that stock price changes from day to day are accidental or haphazard; changes are independent of each other and have the same probability distribution. For a simple random walk, the best forecast of tomorrow's price is today's price. Related: Mean reversion.Random Walk TheoryAn investment philosophy holding that security prices are completely unpredictable, especially in the short term. Random walk theory states that both fundamental analysis and technical analysis are wastes of time, as securities behave randomly. Thus, the theory holds that it is impossible to outperform the market by choosing the "correct" securities; it is only possible to outperform the market by taking on additional risk. Critics of random walk theory contend that empirical evidence shows that security prices do indeed follow particular trends that can be predicted with a fair degree of accuracy. The theory originated in 1973 with the book, A Random Walk Down Wall Street. See also: Efficient markets theory.random walk see EFFICIENT-MARKETS HYPOTHESIS.AcronymsSeered winerandom walk
Words related to random walknoun a stochastic process consisting of a sequence of changes each of whose characteristics (as magnitude or direction) is determined by chanceRelated Words |