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Abstract:
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Address-based sample frames have emerged as a solution to shrinking RDD frame coverage due to cell phone-only households. Knowledge Networks' probability-based online KnowledgePanel® has used RDD frames for telephone recruiting since 1999. In 2008, KN conducted a pilot study (n= 10,000) to recruit panelists via mail using an ABS frame. KN developed/tested recruitment materials (advance postcard/initial mailer/non-respondent mailer) and a post-mailing telephone follow-up protocol. Half the sample was mailed the advance postcard, half was not. Randomized portions of each half received a $5 cash incentive, $1, or $0. Non-respondents with a landline match received a recruitment telephone call; the rest were mailed a reminder letter. Response was allowed via mail, online, or toll-free number. Results show demographic response/mode response/nested incentive conditions/advance postcard effects.
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