nonresponse
Noun
Meaning
nonresponse (countable and uncountable, plural nonresponses)
The absence of a response.
Examples
Excluding subjects who move out of the study area during follow-up is rather equivalent of dropout or nonresponse, a selection bias in that it rather affects the internal validity of the study.
For surveys with substantial nonresponse, statisticians have proposed statistical models, with which data sets are analyzed.
Even though the units are initially chosen with known probabilities, the nonresponse mechanisms are unknown.
Swedes Richard Valliant, Alan H. Dorfman, and Richard M. Royall (2000), Finite Population Sampling and Inference: A Prediction Approach, Wiley, New York, p. 19 For example, many surveys have substantial amounts of nonresponse.