Search Results - "Ragland, David R."

Using Geographically Weighted Poisson Regression for county-level crash modeling in California by Li, Zhibin, Wang, Wei, Liu, Pan, Bigham, John M., Ragland, David R.

“…•We use Geographically Weighted Poisson Regression for county-level crash modeling.•GWPR model is useful in dealing with spatial heterogeneity in county level…”
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Physical environments influencing bicyclists’ perception of comfort on separated and on-street bicycle facilities by Li, Zhibin, Wang, Wei, Liu, Pan, Ragland, David R.

“…► We examine impacts of physical environments on bicyclists’ perception of comfort. ► Study is conducted on physically separated and on-street bicycle…”
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The impact of health problems on driving status among older adults by MacLeod, Kara E., Satariano, William A., Ragland, David R.

“…This study assessed the impact of health problems on driving status (current driver vs. ex-driver) among older adults to identify which of those health…”
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Physical workload, ergonomic problems, and incidence of low back injury: A 7.5-year prospective study of San Francisco transit operators by Krause, Niklas, Rugulies, Reiner, Ragland, David R., Syme, S. Leonard

“…Background The etiologic role of biomechanical factors for low back injury (LBI) needs to be confirmed in prospective studies that control for psychosocial…”
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Bicycle commuting market analysis using attitudinal market segmentation approach by Li, Zhibin, Wang, Wei, Yang, Chen, Ragland, David R.

“…► We segment bicycle commuting market into several submarkets by travelers’ attitudes. ► We present a comprehensive approach for attitude-based market…”
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Safety in Numbers for walkers and bicyclists: exploring the mechanisms by Jacobsen, Peter Lyndon, Ragland, David R, Komanoff, Charles

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Physical Activity and Reduced Occurrence of Non-Insulin-Dependent Diabetes Mellitus by Helmrich, Susan P, Ragland, David R, Leung, Rita W, Paffenbarger, Ralph S

“…NON-INSULIN-DEPENDENT diabetes mellitus (NIDDM), which affects 10 to 12 million Americans over the age of 20 years, 1 2 3 is a complex disorder characterized…”
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Modeling secondary accidents identified by traffic shock waves by Junhua, Wang, Boya, Liu, Lanfang, Zhang, Ragland, David R.

“…•We propose a dynamic method based on traffic shock waves detecting to identify the secondary accidents.•We build a logistic regression model to investigate…”
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Dichotomizing Continuous Outcome Variables: Dependence of the Magnitude of Association and Statistical Power on the Cutpoint by Ragland, David R.

“…Dichotomizing a continuous outcome variable casts that variable in traditional epidemiologic terms (that is, disease, no disease). One consequence is overall…”
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Geocoding police collision report data from California: a comprehensive approach by Bigham, John M, Rice, Thomas M, Pande, Swati, Lee, Junhak, Park, Shin Hyoung, Gutierrez, Nicolas, Ragland, David R

“…Collision geocoding is the process of assigning geographic descriptors, usually latitude and longitude coordinates, to a traffic collision record. On…”
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Driving Cessation and Increased Depressive Symptoms by Ragland, David R., Satariano, William A., MacLeod, Kara E.

“…Background. To understand the consequences of driving cessation in older adults, the authors evaluated depression in former drivers compared with active…”
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Utilizing the eigenvectors of freeway loop data spatiotemporal schematic for real time crash prediction by Fang, Shou’en, Xie, Wenjing, Wang, Junhua, Ragland, David R.

“…•The shortcomings of the previous study on accident precursor models include multicollinearity, failing to reflect the overall traffic flow status before the…”
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Identification of freeway secondary accidents with traffic shock wave detected by loop detectors by Wang, Junhua, Xie, Wenjing, Liu, Boya, Fang, Shou’en, Ragland, David R.

“…•Previous research generally classified secondary incidents by predefining fixed spatio-temporal boundaries—a method that can be very subjective. Some other…”
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Factors associated with hit-and-run pedestrian fatalities and driver identification by MacLeod, Kara E., Griswold, Julia B., Arnold, Lindsay S., Ragland, David R.

“…► We analyzed national, single pedestrian-vehicle fatal crashes for a 10 year period. ► We identified factors related to hit-and-run crashes and driver…”
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Missed or Delayed Medical Care Appointments by Older Users of Nonemergency Medical Transportation by MacLeod, Kara E, Ragland, David R, Prohaska, Thomas R, Smith, Matthew Lee, Irmiter, Cheryl, Satariano, William A

“…This study identified factors associated with canceling nonemergency medical transportation appointments among older adult Medicaid patients. Data from 125,913…”
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Objective Stress Factors, Accidents, and Absenteeism in Transit Operators: A Theoretical Framework and Empirical Evidence by Greiner, Birgit A, Krause, Niklas, Ragland, David R, Fisher, June M

“…The authors used observational job analysis as a conceptually based technique to measure stress factors unbiased by worker appraisal with 81 transit driving…”
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Surrogate safety measure for evaluating rear-end collision risk related to kinematic waves near freeway recurrent bottlenecks by Li, Zhibin, Ahn, Seongchae, Chung, Koohong, Ragland, David R., Wang, Wei, Yu, Jeong Whon

“…•Developed rear-end collision risk index (RCRI) using loop detector data.•Proposed model assesses rear-end collision risk near bottlenecks in real-time.•RCRI…”
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Pilot Model for Estimating Pedestrian Intersection Crossing Volumes by Schneider, Robert J., Arnold, Lindsay S., Ragland, David R.

“…Better data on pedestrian volumes are needed to improve the safety, comfort, and convenience of pedestrian movement. This data collection requires more…”
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Non-Emergency Medical Transportation Needs of Middle-Aged and Older Adults: A Rural-Urban Comparison in Delaware, USA by Smith, Matthew Lee, Prohaska, Thomas R, MacLeod, Kara E, Ory, Marcia G, Eisenstein, Amy R, Ragland, David R, Irmiter, Cheryl, Towne, Samuel D, Satariano, William A

“…: Older adults in rural areas have unique transportation barriers to accessing medical care, which include a lack of mass transit options and considerable…”
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Acceptance of drinking and driving and alcohol-involved driving crashes in California by MacLeod, Kara E., Karriker-Jaffe, Katherine J., Ragland, David R., Satariano, William A., Kelley-Baker, Tara, Lacey, John H.

“…•We conducted a cross-sectional survey of weekend, nighttime drivers in California.•We explored perceived drinking and driving risk and city alcohol-involved…”
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