Attractor dimension of time-averaged climate observables: insights from a low-order ocean-atmosphere model

The climate system involves a complex interplay between the ocean and atmosphere. Studies of this interplay typically rely on model simulations in comparison with time series data for some feature of oceanic and/or atmospheric circulation on a regional or larger scale. Read more

Modeling continuous time series with many zeros and an application to earthquakes

A leading model in earthquake forecasting is the epidemic-type aftershock sequence model, which takes the times and locations of future aftershocks to depend on previous earthquakes, with more recent earthquakes exerting more influence than older events. Read more

Reciprocity and success in academic careers

Since the 1950s, assessments of the quality and effectiveness of scientific research have increasingly rested on quantitative measures based on publication citations. Read more

A semi-parametric spatiotemporal Hawkes-type point process model with periodic background for crime data

Criminologists try to predict crime with a number of methods, such as “hot-spotting” – making maps of locations where crimes tend to occur – and epidemiological techniques based on the assumption that the local risk  of crime rises temporarily after a crime occurs. Read more