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This is known as length based or size biased sampling.
The 1997 results were hence of a statistically biased sampling.
Press' later proposal to use square root biased sampling for airport security was published in 2009.
These conclusions can of course be applied to biased sampling of other items than fish.
Press developed square root biased sampling as a way to sample long sequences of DNA.
They suffer from the hindsight bias due to selective activation or biased sampling of that set of images.
The asymptotic efficiency of length biased sampling depends compared to random sampling on the underlying distribution.
Enoplan nemerteans do not appear to be equally common sublittorally, but this may be a result of biased sampling (less accessible environments).
Quantifying the actual number of addicted individuals has proven to be a complex and nuanced task, particularly because of difficulties with incomplete or biased sampling.
An even earlier discovery was by Martin L. Shooman, who used square root biased sampling in a test apportionment model for software reliability.
But some industry executives attacked the conclusions of the study as exaggerated and misleading, calling it a biased sampling that failed to demonstrate an intention to bypass anyone.
Statistically significant departures could indicate biased sampling or they could indicate that the study population is experiencing detectably strong natural selection at that locus.
Square root biased sampling is a sampling method proposed by William H. Press, a computer scientist and computational biologist, for use in airport screenings.
This may be an extreme form of biased sampling, because certain members of the population are totally excluded from the sample (that is, they have zero probability of being selected).
Fisher's noncentral hypergeometric distribution is useful for models of biased sampling or biased selection where the individual items are sampled independently of each other with no competition.
For example, if someone from a profiled group is nine times more likely than the average person to be a security risk, then when using square root biased sampling, people from the profiled group would be screened three times more often than the average person.
