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Pew Research CenterApril 28, 2016
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Most samples overrepresent whites and college graduates, on unweighted basis

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Most samples overrepresent whites and college graduates, on unweighted basis

Infographics

Accuracy of online survey estimates varies substantially across vendors
Online samples tend to display a distinct socioeconomic profile
ATP shows larger errors for civic and political estimates than others
Estimates for Hispanics and blacks show the largest biases of all major subgroups
Biases tend to be larger for younger adults than for older adults
Substantial variability across samples in predicting smoking
All samples perform well in predicting health insurance coverage
Substantial variability across samples in predicting volunteering
Samples are similar and limited in their ability to predict voting in local elections
Online nonprobability samples struggle with marginal effects of race and ethnicity
Most samples overrepresent whites and college graduates, on unweighted basis
Unweighted demographics are largely unrelated to accuracy
All samples overestimate volunteering, but some do so more than othersch3 02
Online samples tended to overestimate voter registration
Online samples tilt more Democratic than telephone RDD samples ch3 04
Partisan views on government ch3 05
Estimates from different online samples run the gamut from highly variable to highly consistent

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