A voluntary response sample is a sample whose members choose for themselves whether to participate. Since people with strong opinions or unusual experiences may be more likely to respond, a voluntary response sample is generally not representative of the target population and is subject to statistical bias.
Voluntary Response Sample
See also
Convenience Sampling, Population, Response Bias, Sample, SamplingExplore with Wolfram|Alpha
References
Moore, D. S. and McCabe, G. P. Introduction to the Practice of Statistics, 4th ed. New York: W. H. Freeman, 2002.Cite this as:
Weisstein, Eric W. "Voluntary Response Sample." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/VoluntaryResponseSample.html