===Long-range correlated walks=== Long-range correlated time series are found in many biological, climatological and economic systems. == Bibliography == ...
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Price changes in securities that are (a priori) purely random. Expected behaviour in efficient markets....
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in probability theory, a process for determining the probable location of a point subject to random motions, given the probabilities (the same at ... [5 related articles]
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A process in which the position of a particle changes by discrete steps of fixed length, and the direction of each step is chosen randomly. Random walks have interesting mathematical properties that vary greatly depending on the number of dimensions in which the walk takes place and whether it is co...
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Theory 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.
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A random walk is a random process y
t like: y
t=m+y
t-1+e
t where m is a constant (the trend, often zero) and e
t is white noise. A random walk has infinite variance and a unit root. Source: Greene, 1993, p 559 Contexts: econometrics; stati...
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Theory that stock price changes from day to day are at random; the changes are independent of each other and have the same probability distribution. Many believers of the random walk theory believe that it is impossible to outperform the market consistently without taking additional risk.
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A walk in one or more dimensions that is dictated by the outcome of a coin toss. The direction of each step of the walk is specified by the coin toss. The resulting random motion is often referred to as Brownian motion.
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<cell biology> A description of the path followed by a cell or particle when there is no bias in movement. The direction of movement at any instant is not influenced by the direction of travel in the preceding period. If changes of direction are very frequent, then the displacement will be small, unless the speed is very great and the object ...
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Theory that stock price changes from day to day are accidental or haphazard; changes are independent
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A probability model for movement direction and angle often simulated using Monte Carlo methods.
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A description of the path followed by a cell or particle when there is no bias in movement. The direction of movement at any instant is not influenced by the direction of travel in the preceding period. If changes of direction are very frequent, then the displacement will be small, unless the speed is very great, and the object will appear to vibrate on the spot. Although the behaviour of moving cells in a uniform environment can be described as a random walk in the long term, this is not true in the short term because of persistence.
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The theory espoused by French Mathematician Louis Bachelier in 1900 which posits that past share... <a target=_blank href='http://www.finance-glossary.com/terms/random-walk.htm?id=1208&ginPtrCode=00000&PopupMode=false' title='Read full definition of random walk'>more</a>
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Is the financial theory that asserts that changes in price or rate time series are unpredictable. However, the theory recognizes that there is a statistical interdependency between the data. This non-random stickiness is sometimes referred to as autocorrelation or serial correlation.
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noun a stochastic process consisting of a sequence of changes each of whose characteristics (as magnitude or direction) is determined by chance
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