population (redirected from Population mean)

pop·u·la·tion (ppy-lshn)

n.

1. The total number of people inhabiting a specific area.

2. The set of individuals, items, or data from which a statistical sample is taken.

3. All the organisms that constitute a specific group or occur in a specified habitat.

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population

[pop′yəlā′shən]

Etymology: L, populus, the people

1 an interbreeding group of individuals characterized by genetic continuity through several generations.

2 a group of individuals collectively occupying a particular geographic locale.

3 any group that is distinguished by a particular trait or situation.

4 any group from which samples may be measured for some variable characteristic for statistical purposes.

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population,

n the instances about which a statement is made; all events, organisms, and items of a stated kind occurring or in existence in a specified time. In statistics, a hypothetic infinite supply or universe of events or objects like those being studied and from which a sample was drawn.

Pontic.

population, at-risk,

n the individuals belonging to a certain group or community who have the potential to contract a medical condition.

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population

all of the animals in a specifically defined area considered as a whole. The population may also be defined in modes other than geography, e.g. the cow population, a species specification, the nocturnal bird population.

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binomial population

see binomial population.

population cartogram

a map of populations.

case population

see case population.

closed population

e.g. closed herd or flock; a population into which no introductions are permitted, including artificial insemination or embryo transfer; the population is genetically and/or hygienically isolated.

comparison population

see comparison population.

contiguous p's

the populations are separated but have a common border. Some diseases are very difficult to restrain from spreading from one population to the next.

control population

see control population.

population density

see population density.

experimental population

the population in which the experiment, or trial, is being conducted.

finite population

one capable of total examination by census.

genetic population

see deme.

genetically defined population

one in which the ancestry of the animals in it is known.

population genetics

deals with the frequency of occurrence of inherited characteristics in a population.

infinite population

cannot be examined as a total population because they may never actually exist but are capable of statistical importance.

population limitation

restricting the growth of an animal population by desexing, by culling or by managemental means of interfering with reproduction.

population mean

the mean of the population.

population numbers

see population size (below).

open population

one in which immigration in and out is unrestrained.

parent population

the original population about which it is hoped to make some inferences by examination of a sample of its constituent members.

population proportion

the percentage of the population that has the subject characteristics.

population pyramid

a graphic presentation of the composition of a population with the largest group forming the baseline, the smallest at the apex.

population at risk

see risk population (below).

risk population

the population which is composed of animals that are exposed to the pathogenic agent under discussion and are inherently susceptible to it. Called also population at risk. High or special risk groups are those which have had more than average exposure to the pathogenic agent.

population size

actual counting of a total population, the census method, is not often possible in large animal populations. Alternatives are by various sampling techniques including area trapping, the trapping of all animals in an area, the capture-release-recapture method, the nearest neighbor and line transect methods,

The population size is expressed as the population present at a particular instant. Alternatively it can be expressed as an animal-duration expression when the population is a shifting one and it is desired to express the population size over a period (e.g. cow-day).

stable population

a population which has constant mortality and fertility rates, and no migration, therefore a fixed age distribution and constant growth rate.

target population

in epidemiological terms the population from which an experimenter wishes to draw an unbiased sample and make inferences about it.

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population

Clinical research Universe A group of persons to be described or about which one wishes to generalize, assuming that the group is representative of an entire population. See Control population, Patient population Global village The aggregate of persons in a specified area. See Zero population growth.