随后用
- . xtreg tobinq rd size opr_l lev_h top10 roa hnte i.year, fe
- note: hnte omitted because of collinearity
- . reghdfe tobinq rd size opr_l lev_h top10 roa, absorb(year hnte)
- (MWFE estimator converged in 2 iterations)
- Absorbed degrees of freedom:
- -----------------------------------------------------+
- Absorbed FE | Categories - Redundant = Num. Coefs |
- -------------+---------------------------------------|
- year | 6 0 6 |
- hnte | 2 1 1 |
- -----------------------------------------------------+