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Glynis Ewing

RTI International



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Marcus E. Berzofsky

RTI International



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649 – Longitudinal and Panel Data

Implications of Questionnaire Redesign and Challenges to the Continuation of Trend in the 2011 Police-Public Contact Survey

Sponsor: Survey Research Methods Section
Keywords: questionnaire design, ratio adjustment, split-sample experiment, trend estimation, measurement error, redesign

Glynis Ewing

RTI International

Marcus E. Berzofsky

RTI International

Each time an established periodic survey introduces a newly redesigned field instrument, there is a risk of introducing between-year measurement error that can interrupt the continuation of statistical trend. Regardless of improvements to the measures of interest, a redesigned questionnaire introduces potential instability to the validity of trend estimates for outcomes of interest between survey years. This paper will discuss sources of measurement error specific to redesigned survey instruments, describe methods for evaluating estimate comparability between survey years in the event of a redesign, and provide a solution for adjustment to correct for measurement error, illustrated by select examples from the 2011 Police-Public Contact Survey (PPCS).

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