JSM 2004 - Toronto

Abstract #300829

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Activity Number: 149
Type: Topic Contributed
Date/Time: Monday, August 9, 2004 : 2:00 PM to 3:50 PM
Sponsor: Section on Survey Research Methods
Abstract - #300829
Title: Propensity Score Adjustment for Web Surveys
Author(s): Sunghee Lee*+
Companies: University of Maryland
Address: Joint Program in Survey Methodology, College Park, MD, 20742,
Keywords: web survey ; propensity score adjustment
Abstract:

Most existing methodological web survey studies are focused on the questionnaire design. While findings from those studies are helpful in improving the web survey design, their implications for survey inferences are limited, because of their qualitative nature. Missing from the current literature are statistical examination of web survey data. Propensity score adjustment (PSA) has been suggested as an alternative for statistically surmounting inherent problems in web surveys. However, the link between web surveys and PSA is not well understood as studies that have examined the performance of PSA do not seem to document the statistical procedures or to clearly address the scope of adjustment. Moreover, there has been a minimal amount of evidence for its performance, and the implications are inconclusive. This study attempts to investigate PSA for web surveys. It will provide a clear description of applcation procedures of PSA for web survey data by presenting web survey protocols and stages of correction. It will investigate the applicability of PSA by focusing on volunteer panel web surveys by comparing the performace of different weighting schemes with respect to bias reduction.

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Revised March 2004