Collecting Valid and Reliable Data: Fieldwork Monitoring Strategies in a Health Examination Survey by Irina Kislaya, Ana João Santos, Heidi Lyshol, Liliana Antunes, Marta Barreto, Vânia Gaio, Ana Paula Gil, Sónia Namorado, Carlos Matias Dias, Hanna Tolonen, Baltazar Nunes

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An Evaluation of the quality of interviewer and virtual observations and their value for nonresponse bias reduction by Weijia Ren, Tom Krenzke, Brady West, David Cantor

Subjects: “…Interviewer observations…”
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