sampling

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sampling

the selection of part of a total population of consumers or products whose behaviour or performance can be analysed, in order to make inferences about the behaviour or performance of the total population, without the difficulty and expense of undertaking a complete census of the whole population.

Samples may be chosen randomly, with every consumer or product in the population having an equal chance of being included. Random samples are most commonly used by firms in QUALITY CONTROL where they are used as a basis for selecting products, components or materials for quality testing.

Alternatively, samples may be chosen by dividing up the total population into a number of distinct sub-groups or strata, then selecting a proportionate number of consumers or products from each sub-group since this is quicker and cheaper than random sampling. In MARKETING RESEARCH and opinion polling, quota sampling is usually employed where interviewers select the particular consumers to be interviewed, choosing the numbers of these consumers in proportion to their occurrence in the total population.

Samples may be:

  1. cross-sectional, where sample observations are collected at a particular point in time, for example data on company sales and the incomes of consumers in the current year, embracing a wide range of different income groups, as a basis for investigating the relationship between sales and income;
  2. longitudinal, where sample observations are collected over a number of time periods, for example data on changes in company sales over a number of years and changes in consumer incomes over the same time periods, as a basis for investigating the relationship between sales and income. See STATISTICAL INFERENCES, QUESTIONNAIRE.
References in periodicals archive ?
Meanwhile, media practitioner Fatima Al Award Al Darmaki, 35, said she is keen on representing Abu Dhabi in the next legislative cycle because the FNC plays a vital role in the future direction of the nation.
The FNC -- the nation's parliamentary body -- is tasked with passing, amending or rejecting federal draft laws, including the UAE's Budget, other federal affairs as well as international treaties and agreements in keeping with the constitution.
"Simplicity" was the key word in developing what would become the FNC: simple and inexpensive to produce, but also simple to disassemble and reassemble and to maintain.
The motion at issue was a motion to dismiss for forum non conveniens ("FNC"), which, in the federal courts, (4) argues that an alternative forum exists outside of the United States that is both adequate to hear the litigation and more convenient for this purpose than the U.S.
During the meeting, the two sides discussed ways that the council and FNC could enhance parliamentary relations.
FNC noted that in Portland, December was the ninth consecutive month bringing double-digit year-over-year gains in home prices.
Since the mid-1990s, FNC has offered solutions that automate appraisal ordering, tracking, documentation and review for lender compliance with government regulations.
"We feel very proud to have received this recognition on behalf of the Colombian Coffee Growers," said Roberto Velez, CEO of FNC. "We owe this to the efforts put forth over 1,500 FNC field extensionists, by our team of researchers from the Cenicafe and the FNC team that concentrates on developing sustainable and innovative initiatives."
Just over 35 percent of the 224,279 people eligible to vote, cast their ballots in polling which ended on Saturday night, to choose 20 of the 40 FNC members for the next four years.
FNC's site rests on Highway 7, not far from the firm's current headquarters on Office Park Drive.
The law of forurn non conveniens (fnc) in this country hardly lacks for discussion and analysis.
The FNC is reviewing a draft commercial companies law that would allow full foreign ownership of certain firms, with certain conditions, and has rejected a clause that would have given the UAE cabinet power to let foreign parties own stakes of up to 100 per cent in companies outside the free zones, reported Reuters, fearing a loss of national identity and control.