@article{chetty_friedman_rockoff_2016, 
  title={Using Lagged Outcomes to Evaluate Bias in Value-Added Models}, 
  volume={106}, 
  DOI={10.1257/aer.p20161081}, 
  publisher={American Economic Association}, 
  author={Chetty and Friedman and Rockoff}, 
  year={2016}
  }