haphazard sample

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A group that is selected without regard for any rigorous method of sampling, without using either a random allocation procedure or a systematic nonrandom sampling method, such as every tenth name in a telephone directory. A haphazard sample is just that, i.e., a selection based on no formal predetermined rules whatever. It cannot be considered an unbiased sample. The “person in the street” approach of television interviewers usually uses haphazard sampling.

Subjects: Public Health and Epidemiology.

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