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Yumiko Siegfried

Westat



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David Morganstein

Westat



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Andrea Piesse

Westat



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Sharon Lohr

Westat



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238 – Instrumentation and Data Quality

Why Independent Surveys with the Same Objective Yield Different Estimates

Sponsor: Survey Research Methods Section
Keywords: sampling error, non-sampling errors, inconsistent estimates

Yumiko Siegfried

Westat

David Morganstein

Westat

Andrea Piesse

Westat

Sharon Lohr

Westat

Independent surveys that measure the same quantity typically produce different estimates. While sampling error is one obvious explanation, there are many non-sampling error sources that could contribute to an even greater variation across different studies. In this paper, the authors compare important tobacco-use estimates from several national surveys. They explore variations in the definitions, timing, instrument wording, interview modes, and other methodological dissimilarities that might contribute to those differences. The authors' objective is to inform users of these tobacco-use estimates about notable differences between the surveys and to show the impact these differences can make on the resulting estimates.

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