MatchItSE               MatchItSE: methods for Standard Error
                        estimation
abadie_imbens_se        Abadie Imben's Standard Error for the ATT
add_model_matrix        Rebuilds the model matrix for MatchIt objects
att                     Average Treatment Effect for the Treated (ATT)
bootstrap.se            Non-parametric bootstrap Standard Error for the
                        ATT
lechner_se              Lechner's Standard Error for the ATT
zelig_se                Parametric bootstrap Standard Error for the ATT
