Heckman, James J.; Singer, Burton - In: Handbook of econometrics : volume 3, (pp. 1689-1763). 1986
agents operate are not the time homogeneous laboratory environments assumed in biostatistics and reliability theory. Ad hoc … that incorporate the restrictions produced by economic theory only rarely can be represented by the models used by … variables. Economic theory only provides qualitative guidance on the matter of selecting a functional form for a conditional …