
reports the performance of different estimators over 1000 replications of the **data** subsampling. Each replication results in a different observational dataset D O with different number of treated units n (1) O < N 1 and different number of control units n (0) O < N 0 . For evaluation we consider two criterion over the 1000 replications: the Mean Absolute Error (MAE) and the Median of Abolute Errors (MedAE).