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A Comparison Between Responses From a Propensity-Weighted Web Survey and an Identical RDD SurveyRANDmatt{at}rand.org
Harris InteractiveKZapert{at}harrisinteractive.com
California HealthCare Foundationlpsimon{at}chcf.org
University of California, San FranciscoKHaynesSanstad{at}psg.ucsf.edu
Mt. Sinai School of Medicinesue.marcus{at}mssm.edu
RANDjohn_adams{at}rand.org
RANDspranca{at}rand.org
Ingenixhongjun_kan{at}uhc.com
The Wellcome Trustr.turner{at}wellcome.ac.uk
RANDberry{at}rand.org The authors conducted a large-scale survey about health care twice, once as a web and once as a random digit dialing (RDD) phone survey. The web survey used a statistical technique, propensity scoring, to adjust for selection bias. Comparing the weighted responses from both surveys, there were no significant response differences in 8 of 37 questions. Web survey responses were significantly more likely to agree with RDD responses when the question asked about the respondent’s personal health (9 times more likely), was a factual question (9 times more likely), and only had two as opposed to multiple response categories (17 times more likely). For three questions, significant differences turned insignificant when adjacent categories of multicategory questions were combined. Factual questions tended to also be questions with two rather than multiple response categories. More study is needed to isolate the effects of these two factors more clearly.
Key Words: web survey • propensity weights • phone survey • Harris Interactive • weighting • poststratification • self-selection
Social Science Computer Review, Vol. 22, No. 1,
128-138 (2004) This article has been cited by other articles:
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