Nonresponse bias is statistical bias caused when sampled units that do not respond differ systematically, with respect to a quantity of interest, from sampled units that do respond. Increasing the number of responses does not by itself remove nonresponse bias if the difference persists.
Nonresponse Bias
See also
Response Bias, Sample, Sampling, Statistical Bias, UndercoverageExplore with Wolfram|Alpha
References
Cochran, W. G. Sampling Techniques, 3rd ed. New York: Wiley, 1977.Cite this as:
Weisstein, Eric W. "Nonresponse Bias." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/NonresponseBias.html