sampling

(redirected from analog)
Also found in: Dictionary, Thesaurus, Medical, Legal, Acronyms, Encyclopedia, Wikipedia.
Related to analog: analog watch, Analog signal

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.
Collins Dictionary of Business, 3rd ed. © 2002, 2005 C Pass, B Lowes, A Pendleton, L Chadwick, D O’Reilly and M Afferson
References in periodicals archive ?
The big advantage claimed by analog processing is low power-- really low.
Installing, configuring and maintaining IP cameras is also easier than with analog. Many IP cameras can be configured remotely using an online interface, which simplifies changes and troubleshooting.
Philip Corby, an equipment engineering manager with Analog Devices, explained: "Our technician roles offer extensive variety and the opportunity to work on leading edge technology.
"The number of chips that use both digital and analog components is increasing.
The two products help reduce analog layout creation time.
"That's the nice thing about the system, and one of the reasons we chose it." Although the district bought a few wireless handsets for use out on the athletic fields and playgrounds, Stevenson notes the low-cost analog phones have enough functionality to suit every school's needs.
Temperature-indicating, controlling, and recording instrumentation includes handheld digital and analog pyrometers, infrared thermometers, thermocouple sensors, scanners and controllers.
Analog data received from the camera are equivalent to 8 data bits.
With small-package op amp solutions, Microchip continues to expand into the portable market space, where high-precision analog is required in a space-saving form factor and at a competitive price.
In many cases, engineers have preconceived notions about mixed-signal designs and how analog and digital placement, partitioning and associated design should be performed.
Panasonic Security Systems of Secaucus, New Jersey, has introduced a series of network server solutions that allow integration of IP-addressable and conventional analog cameras, so security professionals can use advanced analog camera systems in a networked environment.
Says Welsh, "We've shown that if you give [a chemical analog of 1,25-D] to an animal that already has a mammary tumor, that tumor will regress." Other researchers, she notes, have used 1,25-D analogs to inhibit the spread of cancer or the growth of blood vessels that feed new tumors in laboratory animals.