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Convenience sampling

Convenience sampling means seeking out members of a population that are available for research purposes

Convenience sampling is a non-probability sampling method where study participants are chosen because their data is readily accessible and available for research purposes. When busy clinicians conduct research using retrospective data, convenience sampling is the most common sampling method because the predictor, confounding, clinical, and outcome variables already exist and can be mined and analyzed with quick turnaround. Convenience sampling, as per the nomenclature of the work, means that researchers sample from populations that are convenient to immediate geographical and/or clinical area where research is being conducted.

Since randomization is not used with convenience sampling, causal inferences cannot be found using data retrieved from these types of samples. Selection biases are introduced into research projects that use convenience sampling. Segments of the existing population may be under-represented in these types of samples and can lead to false treatment effects. Convenience should be used only when all other sampling methods cannot be used.

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