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We are committed to meeting the highest methodological standards and to exploring the frontiers of research. http://pewrsr.ch/1zDRQwE
Significant numbers of people may live in an area but have cellphone numbers corresponding to a different geographic area (under-coverage).
Samples of cellphone #s drawn for a particular area inevitably include people who do not live there (over-coverage). http://pewrsr.ch/1SYnSOH
Our recent report examines products that could improve efficiency of surveys in landline & cellphone frames. http://pewrsr.ch/1Of5EqB