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For representative population surveys Hopp & Partner use The Gabler Häder-sampling procedures to take into account the not registered telephonenumbers of the telephone directory. (The Gabler Häder method is also used to create the master sample ADM).

Survey of specific target groups

Surveys can be addressed at the general population or only to specific target groups (for example to motorists, to high earners). The results are representative for the respective defined target group and can thus be extrapolated to the whole of the audience.

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