This paper clarifies the occurrence factors of commuters unable to return home and the returning-home decision-making at the time of the Great East Japan Earthquake by using Twitter data. First, to extract the behavior data from the tweet data, we identify each user’s returning-home behavior using support vector machines. Second, we create non-verbal explanatory factors using geotag data and ve...

BACKGROUND British Columbia, Canada is a geographically large jurisdiction with varied environmental and socio-cultural contexts. This cross-sectional study examined variation in motor vehicle crash rates across 100 police patrols to investigate the association of crashes with key explanatory factors. METHODS Eleven crash outcomes (total crashes, injury crashes, fatal crashes, speed related f...