Probability Sampling - A Guideline for Quantitative Health Care Research

Adwok J

Nairobi Hospital

Correspondence to: Prof. John Adwok, P.O Box 21274-00505, Nairobi, Kenya. Email:



This essay discusses factors considered by researchers when developing a sampling plan including the frame, sampling unit, sample size, target population, precision, and stratification. The sampling methods of probability, both simple and systematic were also defined and compared on their utility for sampling populations. The usefulness of sampling as applied in a quantitative survey study is illustrated by evaluating an article using the characteristics of comprehensiveness, probability of selection, and efficiency.

Keywords: Probability Sampling, Quantitative Research, Sample Size.

Ann Afr Surg. 2015; 12(2): 95-99.


The Annals of African Surgery is the official publication of the Surgical Society of Kenya.


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