R Code for Continental-scale biogeographic variation: provinces vs. gradients

This is the R code used for data preparation and analysis of similarity among provinces and regions used in the paper "Continental-scale biogeographic variation: provinces versus gradients in the Late Ordovician of Laurentia". It uses Paleobiology database data or imported occurrence/abundance matrices.

本代码为论文《大陆尺度生物地理变异：劳伦大陆晚奥陶世的生物地理省与梯度对比》中，用于开展生物地理省及区域间相似性的数据准备与分析工作的R语言代码。该代码可采用古生物学数据库（Paleobiology Database）的数据，或导入的物种出现/丰度矩阵进行分析。