Purposive sampling: Definition, application, advantages and disadvantages

Purposive sampling

Purposive sampling by statisticalaid.com

Purposive sampling also knows as judgmental, selective, or subjective sampling, reflects group of  sampling techniques that rely on the judgment of the researcher. This sampling procedure is always prefer the choice of the researcher. Judgmental sampling is completely opposite of probability sampling such as simple random sampling, stratified sampling, systematic sampling, cluster sampling, multi-stage sampling. So the perposive sampling is a non-probability sampling.

Example of purposive sampling

Specific people, specific organization, specific events which are selected by the researcher according to his perposes.

Application of purposive sampling

·  It is an improved version of simple random sampling and used in research, where the formation of the population is known. This method is used when group is to be arranged in a sequence.

Advantage of purposive sampling

  •         It is a simple method of sampling.
  •         Systematic samples are convenient to draw and excuse.
  •        This method is comparatively economic isn terms of time, labour and money.

Disadvantage of purposive sampling

  •         This information doesn’t represent the population.
  •         Unwillingness to help and co operate
  •         Selecting informants who are convenient for study.
  •         Sampling bias always exist in this sampling.

Types of purposive sampling

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