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Continuous-time stochastic process : ウィキペディア英語版
Continuous-time stochastic process
In probability theory and statistics, a continuous-time stochastic process, or a continuous-space-time stochastic process is a stochastic process for which the index variable takes a continuous set of values, as contrasted with a discrete-time process for which the index variable takes only distinct values. An alternative terminology uses continuous parameter as being more inclusive.〔Parzen, E. (1962) ''Stochastic Processes'', Holden-Day. ISBN 0-8162-6664-6 (Chapter 6)〕
A more restricted class of processes are the continuous stochastic processes: here the term often (but not always〔Dodge, Y. (2006) ''The Oxford Dictionary of Statistical Terms'', OUP. ISBN 0-19-920613-9 (Entry for "continuous process")〕) implies both that the index variable is continuous and that sample paths of the process are continuous. Given the possible confusion, caution is needed.〔
Continuous-time stochastic processes that are constructed from discrete-time processes via a waiting time distribution are called continuous-time random walks.
==Examples==

An example of a continuous-time stochastic process for which sample paths are not continuous is a Poisson process. An example with continuous paths is the Ornstein–Uhlenbeck process.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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