Supplementary material 2 from: Zimmermann H, Loos J, von Wehrden H, Fischer J (2015) Aliens in Transylvania: risk maps of invasive alien plant species in Central Romania. NeoBiota 24: 55-65. https://doi.org/10.3897/neobiota.24.7772

Check for sampling bias.: Explanation note: We checked our dataset for sampling bias, that is the distribution of presence points (N = 1484) at different road distances.