“Independent increments”的意思、由来-开放百科全书

词条

Independent increments

释义

Definition for stochastic processes
Definition for random measures
Independent S-increments
Application
References

In probability theory, independent increments are a property of stochastic processes and random measures. Most of the time, a process or random measure has independent increments by definition, which underlines their importance. Some of the stochastic processes that by definition possess independent increments are the Wiener process, all Lévy processes and the Poisson point process.

Definition for stochastic processes

Let be a stochastic process. In most cases, or . Then the stochastic process has independent increments iff for every and any choice with

the random variables

are stochastically independent.^[1]

Definition for random measures

A random measure has got independent increments iff the random variables are stochastically independent for every selection of pairwise disjoint measurable sets and every . ^[2]

Independent S-increments

Let be a random measure on and define for every bounded measurable set the random measure on as

Then is called a random measure with independent S-increments, if for all bounded sets and all the random measures are independent.^[3]

Application

Independent increments are a basic property of many stochastic processes and are often incorporated in their definition. The notion of independent increments and independent S-increments of random measures plays an important role in the characterization of Poisson point process and infinite divisibility

References

^[1]^[2]^[3]

1 : Probability theory

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