sampling

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Related to MSAS: Masa, Egnos, QZSS, GAGAN

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 ?
Given the expected delays of constellations and ESA product launch, let's not forget about MSAs, which, with all their moving parts, will keep the upper hand in many satcom verticals going forward.
MSA continued to provide other Hanford contractors excellent support in environmental management.
Previously observed increases in firearm suicide rates among persons of all ages continued in recent years, both nationally and in large MSAs collectively; youth firearm suicide rates also increased both nationally and in large MSAs overall.
Therefore, adjusting for price differences across MSAs is essential for generating meaningful comparisons of living standards.
These weights are shown for the four largest Eighth District MSAs and then compared with the average of all MSAs, the five largest MSAs (by population), the average of all other MSAs, and the average of non-metro areas.
Other examples of MSAs experiencing below-average HPI growth during the boom period but larger than average HPI declines during the subsequent bust include Chicago (-32.8%), Atlanta (-28.4%), and Minneapolis (-25.4%).
Total employment in the industrial heartland recovered far more slowly from the 2001 recession than in the two other groups of MSAs. By 2007, employment in the region had risen only 2.6 percent above its 2001 level, compared to 7.2 percent in other manufacturing-intensive MSAs (figure 3).
Housing wages vary substantially across MSAs (Chart 1).
During the training a linguist helps with communication, but MSAS members do have extensive language training before traveling to mitigate the language barrier.
Specialist chemical supplier Integrated Environmental Technologies (OTC QB:IEVM) reported on Monday the launch of two Master Service Agreements (MSA) with two new customers in the Texas Permian region as well as the New Mexico Permian.
Property Valuation Fraud Risk Index for October 2015--TOP 5 MSAs
Besides, it is not mandatory to take the Graduate Record Examination (GRE) or the Graduate Management Aptitude Test (GMAT) for admission, but student with a GPA below a 3.00 on a 4.00 scale, must submit his GRE/GMAT scores," said Dr Gerald Masterson, Programme Coordinator, MSAS, MSU.