coef.staggered_gmm      Extract cohort-by-time effect estimates
confint.staggered_gmm   Confidence intervals for cohort-by-time effects
gmm_j_test              Specification test for unconditional parallel
                        trends and no anticipation
gmm_staggered           GMM estimation of treatment effects under
                        staggered adoption
print.staggered_gmm     Print a fitted staggered GMM model
print.staggered_gmm_jtest
                        Print a specification test result
sim_panel               Simulated staggered adoption panel
summary.staggered_gmm   Summarise a fitted staggered GMM model
vcov.staggered_gmm      Covariance matrix of the estimated
                        cohort-by-time effects
