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In probability theory and statistics, the Poisson distribution (/ ˈ p w ɑː s ɒ n /) is a discrete probability distribution that expresses the probability of a given number of events occurring in a fixed interval of time if these events occur with a known constant mean rate and independently of the time since the last event. [1]
A mixed Poisson distribution is a univariate discrete probability distribution in stochastics. It results from assuming that the conditional distribution of a random variable, given the value of the rate parameter, is a Poisson distribution , and that the rate parameter itself is considered as a random variable.
The shift geometric distribution is discrete compound Poisson distribution since it is a trivial case of negative binomial distribution. This distribution can model batch arrivals (such as in a bulk queue [5] [9]). The discrete compound Poisson distribution is also widely used in actuarial science for modelling the distribution of the total ...
In statistics and probability, the Neyman Type A distribution is a discrete probability distribution from the family of Compound Poisson distribution.First of all, to easily understand this distribution we will demonstrate it with the following example explained in Univariate Discret Distributions; [1] we have a statistical model of the distribution of larvae in a unit area of field (in a unit ...
Let have a Poisson distribution with expectation , and let ,, … follow a Bernoulli distribution with parameter . In this case, Y {\displaystyle Y} is also Poisson distributed with expectation λ p {\displaystyle \lambda p} , so its variance must be λ p {\displaystyle \lambda p} .
In probability theory and statistics, the Conway–Maxwell–Poisson (CMP or COM–Poisson) distribution is a discrete probability distribution named after Richard W. Conway, William L. Maxwell, and Siméon Denis Poisson that generalizes the Poisson distribution by adding a parameter to model overdispersion and underdispersion.
Raikov’s theorem, named for Russian mathematician Dmitrii Abramovich Raikov, is a result in probability theory.It is well known that if each of two independent random variables ξ 1 and ξ 2 has a Poisson distribution, then their sum ξ=ξ 1 +ξ 2 has a Poisson distribution as well.
In statistics, Poisson regression is a generalized linear model form of regression analysis used to model count data and contingency tables. [1] Poisson regression assumes the response variable Y has a Poisson distribution, and assumes the logarithm of its expected value can be modeled by a linear combination of unknown parameters.