Original Research

Sampling bias in physiotherapy research

J. A. Hendry
South African Journal of Physiotherapy | Vol 42, No 1 | a822 | DOI: https://doi.org/10.4102/sajp.v42i1.822 | © 2018 J. A. Hendry | This work is licensed under CC Attribution 4.0
Submitted: 02 October 2018 | Published: 28 February 1986

About the author(s)

J. A. Hendry, Department of Physiotherapy, University of Stellenbosch, South Africa

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Abstract

In this article the difference between random error (due to sampling variability) and systematic error (or bias) is briefly illustrated. Major types of systematic error which occur due to errors in sampling are discussed briefly with reference to the following study designs: the randomized clinical trial, cohort analytical, cross-sectional, case control and before-after studies.


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