The Difference in Sampling Frames of RDD Telephone Survey

Abstract

The difference in sampling frames of RDD telephone survey after redefinition was verified.
Previously, sampling frames of the RDD telephone survey were largely separated between the working exchange and list-assisted designs. However, the telephone number system has changed in recent years. This research, reflecting those changes, redefined the working exchange design in order to divide the working exchange frames into two categories: one including telephone numbers belonging to carriers other than NTT and the other including telephone numbers belonging to only NTT.
The verification of the difference in the sampling frames confirmed the following two findings: first, as for the list-assisted design, comparing with the NTT-working exchange, its coverage was low at most by approximately 3-4%, while efficiency in physical inspection was promoted. Second, the samples collected in the NTT-working exchange frame were different only in their attribution and reply results. This verification proved the efficiency of the list-assisted design; however, it was also discovered that a population exists that could be collected only by NTT.