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Martha Rozsi

Westat



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William Cecere

Westat



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Sharon Lohr

Westat



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James Green

Westat



118 – Issues, Challenges, and Solutions in Modernizing NHTSA's NASS

Creating a Flexible and Scalable Psu Sample for Nhtsa's New National Automotive Sampling System

Sponsor: Survey Research Methods Section
Keywords: Primary sampling units, sample design, stratification, scalable sample size

Martha Rozsi

Westat

William Cecere

Westat

Sharon Lohr

Westat

James Green

Westat

The new National Automotive Sampling System (NASS) sample design requires a flexible and scalable PSU sample to be able to respond to future budgetary constraints and data precision needs. The future sample for the NASS could have between 16 primary sampling units (PSUs) and 101 PSUs for the General Estimates System (GES) module, and between 16 PSUs and 96 PSUs for the Follow-on Passenger Vehicle (FOPV) module. We describe a mechanism for drawing a PSU sample that allows the PSU sample size to change in the future while maintaining a high level of PSU stratification. Conditional probabilities are formulated that allow the PSUs in the largest PSU sample to be subsampled as needed to meet future budgetary constraints.

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