Data collected through Web surveys, in general, do not adopt traditional probability-based sample designs. Therefore, the inferential techniques used for probability samples may not be guaranteed to be correct for Web surveys without adjustment, and estimates from these surveys are likely to be...

Survey interview languages not only determine who is eligible to participate in certain surveys but may also influence survey estimates. We examined potential biases arising from the exclusion of linguistic minorities using the 2003 California Health Interview Survey (CHIS), a multilingual...

This article describes several features included in a California Health Interview Survey cell phone pilot study that differ from earlier cell phone surveys conducted in the United States. One difference is that the study used a screening design and only adults living in cell-only households were...