Noncoverage and nonresponse in an Internet survey.
Social Science Research, (2007)Аннотация
We explore the correlates of noncoverage and nonresponse in an Internet
survey conducted as part of the Health and Retirement Study (HRS),
a panel study of persons 50 years old and older in the US. About
30% of HRS respondents indicated they used the Internet. Of these,
73% expressed willingness to do a Web survey. A subset of this group
was subsequently sent a mailed invitation to participate in a Web
survey and 78% completed the survey. Using multivariate models, we
find significant demographic, financial, and health-related differences
in access, consistent with other research. There are fewer differences
in willingness (given access) and response (given willingness). However,
disparities in health and socio-economic status persist after controlling
for demographic differences in coverage and response. Weighting on
demographics alone is thus unlikely to yield a representative sample
in such surveys. Noncoverage (lack of access to the Internet) appears
to be of greater concern than nonresponse (unwillingness to participate
given access) for representation in Internet surveys of this age
group.
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