plot.psicaTree          Plots a PSICA tree.
predict.psicaTree       Makes predictions for PSICA tree.
print.psicaTree         Prints a PSICA tree.
prune.psicaTree         Prunes a PSICA tree.
psica                   Create a tree that discovers groups having
                        similar treatment (intervention) effects.
snip.psicaTree          Prunes desired nodes in a PSICA tree.
