random sample


Also found in: Dictionary, Thesaurus, Legal, Financial, Encyclopedia, Wikipedia.
Related to random sample: stratified random sample

ran·dom sam·'ple

a selection on the basis of chance of individuals or items in a population for research; selection is made in such a way that all members presumably have the same chance of being selected.

random sample

A population sample selected by a randomisation method designed to ensure that each subject or patient in a target group has an equal chance of being selected for the treatment arm of the study.

random sample

Statistics A population sample derived by selecting individuals, such that each has the same probability of selection; a group of subjects selected in such a way that each member of the population from which the sample is derived has an equal or known chance–probability–of being chosen for the sample. See Sampling.

ran·dom sam·ple

(randŏm sampĕl)
Selection on basis of chance of individuals or items in a population for research.
References in periodicals archive ?
[R.sup.2] results for the risk adjustment algorithms containing all 122 variables across the samples used for fit and prediction (i.e., matched or random sample) are compared in Table 2.
The aim was that students would come to appreciate how decisions could be made with more certainty if random samples from a broader population were considered, and that every Year 5 student in the population had the same/equal chance of being in the sample.
A sample for this process is "random" when the vials from different populations are mixed together forming a "pool of mixed product", and random samples of n vials are taken over time.
Creating a stratified random sample begins by dividing the population into subgroups (known as strata) based on one or more essential characteristics.
The other 39 studies were all based on random samples, yet nine were nevertheless challenged.
Researchers from the Center for Tobacco Control Research and Education compared a random sample of the top 20 grossing films of the 1950s to movies released in 2001 and 2002.
From a random sample of 5,200 Texas college freshmen, the researchers found that nearly three out of four high-achieving students who didn't make the top cut were still able to attend either Texas A&M University or UT, if they wanted to.
MR Logic examined a random sample of 10,000 unsolicited commercial e-mails each week over four weeks ending Feb.
Bebington and West Wirral and Birkenhead and Wallasey primary care trusts this week begin their second annual survey of a random sample of patients throughout Wirral.
In a case-control study, the conventional practice is to recruit sequential cases (or a random sample) and not re select among them, other than for reasons of ability to participate, such as severity of illness or language problems.
The study included a random sample of records drawn from policies across the nation between June 2000 and 2001.
Systematic random sampling was conducted across the whole area to determine the lowest criterion value, and then a new systematic random sample was taken with adaptive sampling around each tow that exceeded the fixed criterion value.