ACER                    Two-sided test for the average cluster effect
                        ratio estimand
PER                     Two-sided test for the pooled effect ratio
                        estimand
PER_CI                  Construct a two-sided confidence interval for
                        the pooled effect ratio
control_clusters        100 matched control clusters
double_rank             Two-sided double-rank test for Fisher's sharp
                        null hypothesis in a cluster-level proportional
                        treatment effect model
double_rank_CI          Construct a two-sided confidence interval for
                        the proportional treatment effect in a
                        cluster-level proportional treatment effect
                        model
encouraged_clusters     100 matched encouraged clusters
