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Despite post-stratification adjustments for wireless omissions, bias remains, especially among young adults (Call et al. 2011). In recognition of this, nationwide surveys such as the National Immunization Survey (NIS) and the Behavioral Risk Factor Surveillance System (BRFSS) have begun to include dual sampling frames of landline and wireless communication (Centers for Disease Control and Prevention 2012; Pierannunzi et al. 2012).

It’s Worse Than We Thought – Landline RDD Unreachable Young Adults in a College Town