Data and code from: Pest host expansion as a scale-free stepwise process across the host phylogeny

This dataset includes data and code for estimation and analysis of the phylogenetic constraint of pests and pathogens on North American tree genera. It contains two data .csv files with information about known pest host genera and pest nativity to North America originating from Wang et al. 2022, and four R files that download necessary files, run simulations and machine learning models, and plot figures, which should be run in order. These data and files are published with a CC0 license and are available for reuse.
, , , # Data and code from: Pest host expansion as a scale-free stepwise process across the host phylogeny

## Description of the data and file structure

This code reproduces analyses performed in *Pest Host Expansion as a Scale-Free Stepwise Process Across the Host Phylogeny*  (Kruger et al. 2025, DOI: 10.1098/rspb.2025.1793), utilizing data from Wang et al. ([https://doi.org/10.1111/1365-2745.13995](https://doi.org/10.1111/1365-2745.13995)). The code simulates host ranges of pests under different patterns of phylogenetic constraint, as described by an exponential parameter that controls a power-law function. The code estimates parameters for known host ranges of pests in North America, compares between types of pests, and estimates risk to plant genera upon further host range expansion.

### Files and variables

1_filesetup.R downloads files from Wang et al. 2022 and modifies them for use in the following code. This code is optional to run, as the generated files are also included directly...,