  Entropic Dynamics (ED) is a framework that allows the formulation of
dynamical theories as an application of entropic methods of inference. In the
generic application of ED to derive the Schroedinger equation for N particles
the dynamics is a non-dissipative diffusion in which the system follows a
"Brownian" trajectory with fluctuations superposed on a smooth drift. We show
that there is a family of ED models that differ at the "microscopic" or
sub-quantum level in that one can enhance or suppress the fluctuations relative
to the drift. Nevertheless, members of this family belong to the same
universality class in that they all lead to the same emergent Schroedinger
behavior at the "macroscopic" or quantum level. The model in which fluctuations
are totally suppressed is of particular interest: the system evolves along the
smooth lines of probability flow. Thus ED includes the Bohmian or causal form
of quantum mechanics as a special limiting case. We briefly explore a different
universality class -- a non-dissipative dynamics with microscopic fluctuations
but no quantum potential. The Bohmian limit of these hybrid models is
equivalent to classical mechanics. Finally we show that the Heisenberg
uncertainty relation is unaffected either by enhancing or suppressing
microscopic fluctuations or by switching off the quantum potential.
