"noncontacts" - 1 õppematerjal

Vormistamine ülesanne 3

The nonresponse is then selective nonresponse and certain groups may be underrepresented. In the worst case, there is a substantial association between the nonresponse and an important variable of the study causing biased results. A classic example comes from mobility studies: people who travel a lot are more difficult to contact for an interview on mobility than people who travel rarely. Thus, selective nonresponse caused by specific noncontacts leads to an underestimate of mobility. For more examples, see Lynn (Chapter 3). Two main approaches are used to cope with nonresponse: reducing and adjusting. Nonresponse reduction applies strategies that, in general, reduce the number of noncontacts and refusals. Causes of noncontact depend on the specific survey design. For instance, in face-to-face surveys, noncontact can be the result of the inability of the interviewer to reach the respondent within the allotted number of contact attempts