@article{190503151,
  title = {Unrestricted Permutation forces Extrapolation: Variable Importance Requires at least One More Model, or There Is No Free Variable Importance},
  author = {Giles Hooker and Lucas Mentch and Siyu Zhou},
  year = {2019},
  eprint = {1905.03151},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1905.03151v2},
}