Recruitment methods creating bias

Recruitment methods creating bias I was lucky to have me information from teams leading institutes audience measurement hearing. One point that is most disturbing the representativeness of the recruited for these measures. One factor through the most important is the rate of refusal to participate in the investigation or panel. But for audience measurement, much would be very difficult to recruit: 9 out of 10 refuse during telephone surveys, nearly 99 out of 100 for panels to people meters. This is far above the standards that would have to pretend that representative samples. Some profiles (upper socio-professional categories in the example) proved to be impossible to recruit. This means that some key targets would simply not represented. Although their presence is indicated in the methodological notes institutes. Contrary to what is said by some, no method of recovery can correct these problems. Samples are unfortunately largely composed of atypical people who can not realize the real hearings.