A critical part of any risk assessment is identifying how to represent exposure to the risk involved. Recent research shows that the relationship between crash count and traffic volume is nonlinear; consequently, a simple crash rate computed as the ratio of crash count to volume is not suitable for comparing the safety of sites with different traffic volumes. To solve this problem, we describe ...

The images show kernel density sum of all ship traffic close to Stavanger in a given time period. These plots gives a good quantitative measurement on the volume of traffic in the different areas. If the user investigates how the traffic volume changes over time, however, a side by side presentation will only provide a qualitative idea on changes. Changes (or differences) are made explicit by c...

Making a website findable is critical nowadays, so web analytics tools that monitor website traffic have become key online marketing tools. Our aim is to assess the changes over time in the performance of a website using Google Analytics data and within a statistical framework that enables us to test the effectiveness of online campaigns. A time series econometric methodology is applied based o...