bal.cs.psa              Balance for Categorical Covariate: Random
                        Strata as part of a PSA
bal.fe.psa              Fisher's Exact Test for Independence of
                        Treatments within Strata
bal.ks.psa              Kolgomorov-Smirnov 2 sample tests for multiple
                        strata
bal.ms.psa              Balance for Continuous Covariate: Random Strata
                        as part of a PSA
box.psa                 Compare balance graphically of a continuous
                        covariate as part of a PSA
cat.psa                 Compare balance graphically of a categorical
                        covariate as part of a PSA
circ.psa                Graphically investigate strata effect size
                        contributions in a PSA
lindner                 Data on 996 initial Percutaneous Coronary
                        Interventions (PCIs) performed in 1997 at the
                        Lindner Center, Christ Hospital, Cincinnati.
loess.psa               Graphical and loess based estimate of effect
                        size using propensity scores
