@article{onprincipalcomponentregressioninahigh,
  title = {On Model Identification and Out-of-Sample Prediction of Principal Component Regression: Applications to Synthetic Controls},
  author = {Anish Agarwal and Devavrat Shah and Dennis Shen},
  year = {2020},
  eprint = {2010.14449},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2010.14449v5},
}