31.1 Key Concepts

• Quantile Treatment Effect on the Treated (QTT):
  • Measures the difference in quantiles of the potential outcome distributions for treated units.
• Rank Preservation:
  • Assumes that the rank of an individual remains unchanged across different potential outcome distributions.
  • This is a strong assumption and should be considered carefully in empirical applications.
• Counterfactual Distribution:
  • The main estimation challenge in CiC is constructing the counterfactual distribution of outcomes for treated units in period 1.