8.3 Overlap/common support

  • Q: Inspect Figure 8.1 below: Are there areas in the distribution below where we don’t have common support across treatment/control focusing on the covariate education?
    • Find a unit (ID = ?) in the control group that has no exact equivalent in the treatment group.
    • Q: Assume you increase the number of variables (covariates) on which you match. Does that make it more or less difficult to find matches? Exact vs. inexact matching?
  • Q: Do you have experiences with matching? What problems did you encounter?