Before revision:   I propose a new nonparametric multiple treatment selection model that provides a general setup to define a range of parameters evaluating the effects of program access and to exploit the partial information the data may provide on where access was received .
After revision:  I propose a new nonparametric selection model with unobserved choice sets that provides a general setup to define a range of parameters evaluating the effects of program access and to exploit the partial information the data may provide on where access was received .