Poisson sampling
In survey methodology, Poisson sampling (sometimes denoted as PO sampling ) is a sampling process where each element of the population is subjected to an independent Bernoulli trial which determines whether the element becomes part of the sample.
Each element of the population may have a different probability of being included in the sample ($\pi_i$). 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 ( $p_{i}$). 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. - Wikipedia
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