PanelSelect             Sample Selection Models for Panel Data
probitRE_PLNRE          Poisson Lognormal Model with Random Effects and
                        Sample Selection
probitRE_PoissonRE      Poisson RE model with Sample Selection
probitRE_linearRE       Panel Sample Selection Model for Continuous
                        Outcome
probitRE_probitRE       Panel Sample Selection Model for Binary Outcome
