Naturalistic Driving Study: Descriptive Comparison of the Study Sample with National Data (2015) / Chapter Skim
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16 C h a p t e R 4 Chapter 3 documents how the SHRP 2 NDS data came from a convenience sample of drivers. Analysts using the data must keep this sampling method firmly in mind.
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17 aggregated geographic areas from which the sample was drawn ($63,419) , data collection sites weighted according to nominal DAS allocation ($65,384)
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18 Source: U.S. Census Bureau 2010d.
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19 Source: U.S. Census Bureau 2010f.
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20 Source: U.S. Census Bureau 2010h.
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21 Figure 4.8. SHRP 2 sample marital status.
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22 Source: U.S. Census Bureau 2010g.
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23 Source: R
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24 Figure 4.14. SHRP 2 crashes by severity level (confirmed crash evaluations as of June 30, 2014)
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25 The number of crashes increased as the crash severity level decreased. The data represented in Figure 4.14 are shown by data collection site in Table 4.2.
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26 PPR crash rate point estimate is around twice that of the U.S. rate in 2012.
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27 Table 4.5. 2010 Crash Data by State State No.
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28 data set are displayed. The national crash rate (i.e., from all 50 states; Washington, D.C.; and Puerto Rico)
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