In recent years, collaborative knowledge production has become a central concern, not only for the scientific community but also for policy makers. In particular, there is a lively debate on the role of geographical space for research collaborations. Up to now, nearly no systematic empirical...

In this paper, a Poisson gravity model is introduced that incorporates spatial dependence of the explained variable without relying on restrictive distributional assumptions of the underlying data generating process. The model comprises a spatially filtered component including the origin,...