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In planning surveys with a cell telephone sample component, survey researchers often think in terms of a cost ratio – the cost per complete interview in the cell phone sample relative to that in the landline sample. AAPOR’s 2010 Cell Phone Task Force Report includes a discussion of the factors that affect this cost ratio; however, the report does not discuss the impact of the rarity of the target population on the relative costs of cell telephone surveys. That is, the cellto-landline cost ratio may be different for a rare population survey compared to a general population survey, and the difference will depend on the size and characteristics of the target population being studied. In this paper, I describe why this is true and present a cost-ratio formula that separates the components expected to vary depending on the nature of the rare target population from the components that should be relatively constant across surveys with differing target populations. I discuss the usefulness of this formula in planning for and monitoring cell phone data collection, and I provide a demonstration.

Cell-to-Landline Cost Ratios for RDD Surveys of Rare Populations