nonresponse

Examples of nonresponse in the following topics:

• How Well Do Probability Methods Work?

  • Another source of bias is nonresponse, which occurs when a selected individual cannot be contacted or refuses to participate in the survey.
  • Nonresponse is often higher in urban areas, so most researchers conducting surveys will substitute other people in the same area to avoid favoring rural areas.
  • When reading the results of a survey, it is important to know the exact questions asked, the rate of nonresponse, and the method of survey before you trust a poll.

• Using Chance in Survey Work

  • In addition, nonresponse effects may turn any probability design into a non-probability design if the characteristics of nonresponse are not well understood, since nonresponse effectively modifies each element's probability of being sampled.

• A Closer Look at the Gallup Poll

  • In addition, there was the problem of nonresponse.
  • Gallup still has to deal with the effects of nonresponse bias, because people may not answer their cell phones.

• Surveys or Experiments?

  • Although censuses do not include a "sample," they do include other aspects of survey methodology, like questionnaires, interviewers, and nonresponse follow-up techniques.

• Sampling Bias

  • He concluded that, in addition to the undercoverage described above, there was a nonresponse bias (a form of self-selection bias) such that those favoring Landon were more likely to return their survey than were those favoring Roosevelt.

• Cardiac Output

  • This chart indicates stroke volume compared to ventricular preload, with labels for preload dependent zone, responsive patient SVV > 10%, and nonresponsive patient SVV < 10 %.