random sample

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random sample

a SAMPLE from a parent population selected by ensuring that each member of that population has an equal chance of being selected. When this is observed the sample should have the same profile of features as the parent population, i.e. it should be a valid representation of it. Data collected by random sampling (assuming the sample is large enough) should reflect the parent population, but methods which are not random (e.g. QUOTA SAMPLING) cannot be relied on to do so. However, it is recognized that samples are not entirely accurate, thus account must be taken of SAMPLING ERROR.

The methods used to achieve random selection may be based on random number tables or, more usually in social surveys, on systematic sampling, i.e. selecting individuals, households, etc. according to their position on a list, such as the ELECTORAL REGISTER, when a sample of every name at a fixed interval, say the tenth on the list, is made. See also PROBABILITY.

References in periodicals archive ?
Figure 5 reports the levels of reclassification of Indigenous status using the logistic and random allocation techniques after restricting the focus solely to those individuals for whom we have complete information on sex, age and geography.
However, since the PEDro database is a database of randomised and quasi-randomised trials, it would be expected that random allocation would be one of the most adhered to items.
While this is an extreme case, it is easy to show that random allocation of workers to plants implies substantial unevenness for plants with as many as fifty or a hundred employees (Carrington and Troske 1997).
After clinical and radiographic examination 250 patients that fulfilled the inclusion criteria were selected and divided into two groups 1 and 2 by using a computer generated list of random numbers with a randomization ratio of 1:1 produced by random allocation software (version 1.
These patients were then randomly divided into two sub-groups 'A' and 'B' through Random Allocation by Table of Random Numbers.
3] Given our climate of health care consumerism, the lack of equipoise is a particular challenge when evaluating interventions that are available off study - why, as a patient, would you subject yourself to a random allocation of treatment A versus B when you can choose?
37 mmol/L (<130 mg/ dL) and high-sensitivity C-reactive protein (hsCRP) concentrations [greater than or equal to]2 mg/L, random allocation to treatment with 20 mg rosuvastatin was associated with a 54% reduction in the incidence of myocardial infarction, a 48% reduction in stroke, a 47% reduction in the need for angioplasty or bypass surgery, a 43% reduction in venous thrombosis, and a 20% reduction in all-cause mortality (1).
However, nature's random allocation of ability has made another sibling, Barnfield Haveit, a short four-bend type.
Methodological limitations of these studies were noted in the review, specific concerns being a lack of random allocation, a lack of blinded assessors, and a lack of similarity of the patient groups at baseline.
It means children with special needs will be given priority, but after that there would be random allocation.
They present a class of such reallocations--correlated matching rules--that includes the status quo allocation, a random allocation, and both the perfect positive and negative assortative matching allocations as special cases.

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