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In the theory of [[finite population sampling]], '''Poisson sampling''' is a [[sampling (statistics)|sampling]] process where each element of the [[statistical population|population]] that is sampled is subjected to an [[statistical independence|independent]] [[Bernoulli trial]] which determines whether the element becomes part of the sample during the drawing of a single sample. | |||
Each element of the population may have a different probability of being included in the sample. The probability of being included in a sample during the drawing of a single sample is denoted as the ''first-order [[inclusion probability]]'' of that element. If all first-order inclusion probabilities are equal, Poisson sampling becomes equivalent to [[Bernoulli sampling]], which can therefore be considered to be a special case of Poisson sampling. | |||
== A mathematical consequence of Poisson sampling == | |||
Mathematically, the first-order [[inclusion probability]] of the ''i''th element of the population is denoted by the symbol π<sub>''i''</sub> and the second-order inclusion probability that a pair consisting of the ''i''th and ''j''th element of the population that is sampled is included in a sample during the drawing of a single sample is denoted by π<sub>''ij''</sub>. | |||
The following relation is valid during Poisson sampling: | |||
:<math> \pi_{ij} = \pi_{i} \times \pi_{j}.\, </math> | |||
==See also== | |||
*[[Bernoulli sampling]] | |||
*[[Poisson distribution]] | |||
*[[Poisson process]] | |||
*[[Sampling design]] | |||
==Further reading== | |||
* Sarndal, Swenson, and Wretman (1992), Model Assisted Survey Sampling, Springer-Verlag, ISBN 0-387-40620-4 | |||
[[Category:Sampling (statistics)]] | |||
[[Category:Sampling techniques]] | |||
Latest revision as of 09:32, 6 December 2013
In the theory of finite population sampling, Poisson sampling is a sampling process where each element of the population that is sampled is subjected to an independent Bernoulli trial which determines whether the element becomes part of the sample during the drawing of a single sample.
Each element of the population may have a different probability of being included in the sample. The probability of being included in a sample during the drawing of a single sample is denoted as the first-order inclusion probability of that element. If all first-order inclusion probabilities are equal, Poisson sampling becomes equivalent to Bernoulli sampling, which can therefore be considered to be a special case of Poisson sampling.
A mathematical consequence of Poisson sampling
Mathematically, the first-order inclusion probability of the ith element of the population is denoted by the symbol πi and the second-order inclusion probability that a pair consisting of the ith and jth element of the population that is sampled is included in a sample during the drawing of a single sample is denoted by πij.
The following relation is valid during Poisson sampling:
See also
Further reading
- Sarndal, Swenson, and Wretman (1992), Model Assisted Survey Sampling, Springer-Verlag, ISBN 0-387-40620-4