Individual Differences and the "High-Risk" Commercial Driver (2004) / Chapter Skim
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Appendix E - Relevant Statistical Concepts
Appendix E - Relevant Statistical Concepts
Pages 60-64
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From page 60... ...
Instead, there are many commercial drivers with very low crash risks and some with elevated risk related to various factors to be discussed in this synthesis. In these situations, the mean is higher than the median since a few high-risk scores raise the overall arithmetic average.
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Positively Skewed Distribution (c) Negatively Skewed Distribution Figure 18.
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Hypothetical correlational relationships.
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Predicted number of drowsy episodes for the sampled group based on the Poisson distribution (assuming that only chance is operating) Figure 21.
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From page 64... ...
Objective predictive measures include driver physical characteristics, average hours of sleep nightly, number of crashes or violations, and age. Subjective predictive measures include driving preferences, self-assessments of fatigue, and self-assessments of driving stress.
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