Diehr P, Koepsell TD, Cheadle A, Psaty BM. Assessing response bias in random-digit dialling surveys: the telephone-prefix method. Stat Med. 1992 Jun 15;11(8):1009-21.
Diehr P, Koepsell TD, Cheadle A, Psaty BM. Assessing response bias in random-digit dialling surveys: the telephone-prefix method. Stat Med. 1992 Jun 15;11(8):1009-21.