Naturalistic Driving Study: Descriptive Comparison of the Study Sample with National Data (2015) / Chapter Skim
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Pages 33-34
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33 a p p e n D i x a In Chapter 2 and Chapter 4, figures depicting comparisons between study recruitment areas, their respective states, and the nation as a whole include a series labeled "Recruitment Site Counties Weighted by Nominal Site Size." Data in these series are weighted based on each site's size, as determined by the number of DAS kits nominally allocated to that site, as outlined in Table A.1. Similarly, figures in Chapter 4 that compare the SHRP 2 NDS sample and other relevant populations include a series labeled "SHRP 2 Sample Weighted According to Age/Gender" derived by weighting the data associated with the study sample according to the distribution of licensed drivers across the United States in 2012, the last full year of data collection.
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34 Table A.2. Weighting Factors for SHRP 2 Sample by Age and Gender Gender Age No.
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