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Activity Number:
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433
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Type:
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Contributed
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Date/Time:
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Thursday, August 12, 2004 : 10:30 AM to 12:20 PM
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Sponsor:
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Section on Survey Research Methods
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| Abstract - #302142 |
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Title:
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Bias from Excluding Households without Telephones in Random Digit Dialing Surveys: Follow-up
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Author(s):
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Mourad Touzani*+ and John W. Hall
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Companies:
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Mathematica Policy Research, Inc. and Mathematica Policy Research, Inc.
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Address:
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PO BOX 2393, Princeton, NJ, 08543,
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Keywords:
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coverage bias ; in-person interviewing ; telephone interviewing ; RDD
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Abstract:
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Surveys conducted by telephone are by their nature restricted to only households with telephone service. While a high proportion of U.S. households have telephone service, there is still concern that the exclusion of households without telephone service may result in biased survey estimates especially where those estimates are correlated with income or other factors associated with lack of telephone service. This paper builds on research using data from the first round of the Community Tracking Survey (CTS) which has an RDD component and an area probability sample for households without telephones. The earlier analysis concluded that some estimates from the CTS would be biased if interviews were not conducted among households without telephones. Using data from Round 3 of the CTS and the approach employed earlier, estimates of potential bias will be evaluated based on the size of the bias relative to the estimates and to their standard errors, and how the bias translates into aggregate estimates, such as persons affected and dollars spent. We will compare estimates of bias for Round 3 to those from Round 1 to see if the potential for bias increased or decreased.
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