Arbitrary sample

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A convenience sample is a sample that is obtained using a completely subjective, i.e. non-random, procedure. It is also referred to as a non-probability sample because the sample selection is made without any static validity, usually for specific reasons.

Since it does not require a complete sampling frame, this type of sampling is a quick, easy and inexpensive way to obtain data. It is often done for an exploratory survey, a pilot study, a case study or a comparative study. This type of sampling is also useful for research that involves a limited number of entities, i.e. subjects, objects or spatial units.