biased sample

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Related to biased sample: random sample

biased sample

A subset of a population that does not represent—either intentionally or unintentionally—an entire population.

biased sample

In epidemiology or medical research, a sample of a group that does not equally represent the members of the group.

See also: sample

References in periodicals archive ?

This section introduces general definitions and background information: a formal description of sample selection bias (Section 2.1), the special case of two-phase case-control studies (Section 2.2), and properties of biased samples (Section 2.3).

Correcting Classifiers for Sample Selection Bias in Two-Phase Case-Control Studies

In other applications of live-capture data, the way to manage bias is less clear and investigators should aim at minimising the bias by using more than one method of capture and apply caution when interpreting the results from possibly biased samples of individuals.

The strong and the hungry: bias in capture methods for mountain hares Lepus timidus

"How can the IWA's conclusions provide an accurate picture or be truly representative when it is based on such a small and seemingly biased sample?"

Report on small schools criticised

But the commission examined a biased sample of cases.

Study shows fraud networks led by CEOs and aided by company outsiders

I suppose this might provide a biased sample, though.

PICK OF THE DAY; Live cricket Sky Sports 1, 2pm

Taylor herself acknowledges that her methodological approach has a number of flaws: the sampling framework employed led to a biased sample, both in terms of gender and of care experience, and there is a lack of quantifiable 'evidence' (which could perhaps have been extracted from case-file records) that could have added weight to the conclusions.

A missed opportunity

Why would any political candidate present results from a biased sample? Puh-lease.

Making sense of polls

For example, the studies have very small sample sizes, biased sample selection, or lack of control groups.

Doctors speak out: 'gay marriage' and homosexuality: brief sent to MPs and to H. of C. special committee

This led to a geographically biased sample, unless the population density of males approximately 20-40 years of age happened to correspond with the catchment areas for testicular cancer of the hospitals used for the recruitment of cases, weighted by the number of cases for each one.

Re: "increased concentrations of polychlorinated biphenyls, hexachlorobenzenes, and chlordanes in mothers of men with testicular cancer"

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