non-response

The Use of Selection Bias Models in Item Non-Response Surveys

Survey researchers inevitably face the problem of item non-response; that is, some respondents provide valid answers to some questions, but provide invalid answers to others, such as “don’t know,” “no opinion,” or “hard to say.” However, including only those respondents who provide valid answers for each question may bias the estimates, because non-response does not occur randomly.

訂閱 RSS - non-response