Abstract #301967

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JSM 2003 Abstract #301967
Activity Number: 292
Type: Contributed
Date/Time: Tuesday, August 5, 2003 : 2:00 PM to 3:50 PM
Sponsor: Section on Survey Research Methods
Abstract - #301967
Title: An Evaluation of Current Nonresponse and Coverage Adjustment Methods in Web Panel Surveys
Author(s): Sunghee Lee*+
Companies: University of Maryland
Address: JPSM, College Park, MD, 20742-0001,
Keywords: web survey ; nonresponse error ; coverage error ; raking ; poststratification
Abstract:

Current web surveys employ different protocols to reduce errors. Among them is recruiting panel members via RDD telephone interviews by providing web TVs as incentives to the participants. By doing so, this method allegedly decreases odds of coverage and sampling errors which are inherent in other web surveys. However, these are only what are hoped for. Moreover, response rates from this method, although the highest among web surveys, are disappointingly low especially after accounting for the loss in the recruitment. Raking adjustment is widely used to correct for these problems under the assumption of ignorability. In spite of these concerns, the quality of web surveys is only vaguely appreciated due to the lack of extensive methodological studies. This study attempts to separately examine nonresponse and coverage in web surveys. Statistics known for the respondents, sample units, and population will be chosen. First, the demographic counts of respondents will be raked to the sample in order to obtain weights and the statistics of respondents will be weighted and compared to the sample. The second step shows the coverage properties by projecting the sample units to the population.

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