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Title Sampling & Weighting Cell Phone Samples to Supplement RDD Surveys
Author Brick, J. M., Edwards, W. S., Lee, Sunghee
Source The American Association for (AAPOR) 63rd Annual Conference, 2008 & WAPOR 61th Annual Conference, 2008
Year 2008
Access date 01.06.2009

The 2007 California Health Interview Survey (CHIS 2007) sampled from both the standard RDD sampling frame and the frame of cell phone numbers. A pilot test of the cell phone sample was conducted in 2006 and the findings of that study informed the design of the fullscale effort in 2007. This paper reports on the sampling and weighting of the 2007 survey. Four sampling issues are addressed. First is the allocation of the sample to the landline and cell phone frames, a topic that has received little attention in previous studies. Second, the allocation of the sample within a geographically stratified design is discussed. While the sample was allocated equally over the entire state in the 2005 pilot, it was allocated differentially by region in 2007 to support making estimates at the county level–a major CHIS objective. The paper explores if the intended effect was achieved. Finally, the ability to sample adults within a household when a cell phone is shared is discussed. The 2005 pilot suggested difficulties in sampling persons other than the person answering the cell phone, but was based on a very small sample. The 2007 larger sample will be more informative. Weighting RDD and cell samples together to form approximately unbiased estimates is a difficult task. The CHIS design screens out landline households in the cell phone sample to facilitate the estimation process. We discuss methods of weighting the combined samples to try to reduce the biases due to differential nonresponse in the two frames. The estimates at the county level, where the cell phone sample size might be very small, are also discussed.

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Year of publication2008
Bibliographic typeConferences, workshops, tutorials, presentations
Full text availabilityAvailable on request