Statistical modeling of traffic crashes has been of interest to researchers for decades. Over the most recent decade many crash models have accounted for extra-variation in crash counts?variation over and above that accounted for by the Poisson density. The extra-variation ? or dispersion ? is...

Abstract: The Insurance Institute for Highway Safety mailed an essay written by Richard Retting and Sergey Kyrychenko (IIHS, 2005) to many universities and individuals where they accused my coauthor and me of being Junk Scientists. This has become a typical pattern for the IIHS, attacking every...

Some researchers have developed a probabilistic model, a traffic multiplication term, for conflicts at urban uncontrolled intersections. However, such estimates lack theoretical bases and depend only on researchers' professional judgements. Few researchers have empirically observed the behaviour...

I jointly use daily data on deaths and public transportation ridership in San Francisco in 1918-19 to estimate a model in which agents choose their level of economic activity based on perceived infection risk, modeled as a function of current and lagged infections or deaths. Agents' choices in...

The Munich Re was founded in 1880 and is from the very start till this day one of the leading insurance companies in the world. Despite its long and successfull existance the company’s history has not been reported yet in a way that fulfilled scientific criteria. This paper can be seen as a...