Purposive Sample

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Definition: Purposive Sample

Purposive sample is a type of non-probability sampling which means selecting a sample by judgement of researcher rather than using mathematical probability for selecting a sample. In purposive sampling researcher targets a group of people among population under consideration based on research. Purposive sampling is useful as it requires less time for selecting purposive sample than other sampling techniques.

Purposive sample can display the results of exact sample required for research compared to other sampling techniques like random sampling which have some redundant results. Purposive sample is used to find sample for a particular purpose or topic of research and can include samples of rare groups. The disadvantages of purposive sample is biasness while sampling does not give equal chance for all the members of population to express opinion for that topic. Also purposive sampling cannot guarantee accuracy of results as samples are selected based on expertise of researcher.

Purposive sampling are done using following methods: Heterogeneous sampling which involves selecting samples from different groups considering topic under research in broader sense. Homogeneous sampling which looks at similarity among samples under consideration for a particular topic. Typical case and deviant case sampling deals with considering a particular case related to topic under consideration and drawing inferences from it. Expert sampling is sampling of population based on expert opinion of topic under research. This is purposive sampling which is judgement based sampling that helps in getting fast, economical and accurate results of topic under consideration.

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