Statistical Modeling in Accident Severity Analysis Quiz
28 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What has enabled safety researchers to extract more information from crash databases?

  • Availability of traditional crash data
  • Increase in crash database size
  • Steady improvement in statistical methodologies (correct)
  • Reduction in injury levels over time

What is a major barrier despite the progress in statistical methodologies?

  • Quality and availability of data sources (correct)
  • Injury-reduction technologies
  • Underreported police data
  • Complex interactions of vehicle, roadway, and human factors

What is the focus of statistical modelling methods in road safety research?

  • Measuring the reduction in injury levels over time
  • Predicting the occurrence of crashes
  • Assessing the impact of various factors on disaggregate-level injury-severity data (correct)
  • Analyzing the effectiveness of injury-reduction technologies

What has improved our understanding of the factors influencing the occurrence of crashes and resulting personal injuries?

<p>Traditional crash data and models (C)</p> Signup and view all the answers

What type of regression model was used to estimate total road traffic deaths?

<p>Negative binomial regression model (A)</p> Signup and view all the answers

How was population used in the regression model for estimating road traffic deaths?

<p>As exposure to interpret the coefficients for independent variables as effects on rates (D)</p> Signup and view all the answers

In the pedestrian crossing behaviour analysis, what was the decision process modelled as?

<p>Discrete choice model (A)</p> Signup and view all the answers

What did the stated preference experiments evaluate in the pedestrian crossing behaviour analysis?

<p>Crossing behaviour in different hypothetical choice scenarios (A)</p> Signup and view all the answers

In the development of pedestrian crossing choice models, what factors significantly affected pedestrian crossing choices?

<p>Road type, traffic flow, and traffic control (C)</p> Signup and view all the answers

What is widely accepted as one of the most important walkability predictors in public spaces?

<p>Perceived safety (B)</p> Signup and view all the answers

What type of model was used to quantify the perception of security in public spaces?

<p>Ordered logit model (C)</p> Signup and view all the answers

In the ordered logit model, what do 𝑈(𝐴𝐵−1) and 𝑉(𝐴𝐵−1) represent?

<p>Utility and systematic portion of utility (B)</p> Signup and view all the answers

What does 𝑅𝑖 represent in the ordered logit model?

<p>Systematically selected alternative (D)</p> Signup and view all the answers

What does 𝜇1 represent in the ordered logit model?

<p>Threshold for the first category (A)</p> Signup and view all the answers

What does 𝜇2 represent in the ordered logit model?

<p>Threshold for the second category (A)</p> Signup and view all the answers

What was the aim of using econometric models to quantify perception of security?

<p>To understand what determines perception of security (C)</p> Signup and view all the answers

What type of regression models address over-dispersion by allowing greater variance than the mean?

<p>Negative binomial regression (B)</p> Signup and view all the answers

What do Poisson regression models estimate the probability of?

<p>A roadway entity having y crashes per time period (C)</p> Signup and view all the answers

What are the injury severities assessed by police officers at the crash scene?

<p>No injury, possible injury, evident injury, disabling injury, fatality (D)</p> Signup and view all the answers

What do crash frequency models aim to determine?

<p>Factors influencing crash frequencies for mitigation strategies (D)</p> Signup and view all the answers

What is used to analyze crashes as the duration of time between incidents?

<p>Duration models (C)</p> Signup and view all the answers

What occurs when the variance of observed accident counts exceeds that expected under a Poisson distribution?

<p>Over-dispersion (C)</p> Signup and view all the answers

What statistical modelling method includes driver behavioral adaptation and risk compensation?

<p>Driver behavioral adaptation and risk compensation are not part of statistical modelling methods (C)</p> Signup and view all the answers

What is used to expand the dataset by linking police data with government-provided roadway information?

<p>Linking police data with government-provided roadway information (D)</p> Signup and view all the answers

Which regression model estimates the probability of a roadway entity having y crashes per time period?

<p>Poisson regression (D)</p> Signup and view all the answers

What aims to determine factors influencing crash frequencies for effective mitigation strategies?

<p>Crash frequency models (A)</p> Signup and view all the answers

Which regression model addresses over-dispersion by allowing greater variance than the mean?

<p>Negative binomial regression (B)</p> Signup and view all the answers

What is the most common source of data extraction in highway-accident studies?

<p>Police crash reports (D)</p> Signup and view all the answers

Study Notes

Statistical Modelling Methods in Accident Severity Analysis

  • Most highway-accident studies use police crash reports for data extraction
  • Injury severities assessed by police officers at crash scene: no injury, possible injury, evident injury, disabling injury, fatality
  • Police-reported data include various factors like time of day, age, road conditions, and crash type
  • Inaccuracies associated with police data are well-documented, including underreporting of less severe crashes
  • Linking police data with government-provided roadway information can expand the dataset
  • Statistical modelling methods include driver behavioral adaptation and risk compensation
  • Crash frequency models aim to determine factors influencing crash frequencies for effective mitigation strategies
  • Models include Poisson regression, negative binomial, zero-inflated Poisson, gamma, and other specialized models
  • Duration models are used to analyze crashes as the duration of time between incidents
  • Over-dispersion occurs when variance of observed accident counts exceeds that expected under a Poisson distribution
  • Negative binomial regression models address over-dispersion by allowing greater variance than the mean
  • Poisson regression models estimate the probability of a roadway entity having y crashes per time period, using explanatory variables

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Description

Test your knowledge of statistical modeling methods in accident severity analysis with this quiz. Explore various factors influencing crash frequencies, over-dispersion, and the use of Poisson regression and negative binomial models.

More Like This

Use Quizgecko on...
Browser
Browser