  We present local numerical models of accretion disk turbulence driven by the
magnetorotational instability with varying shear rate. The resulting turbulent
stresses are compared with predictions of a closure model in which triple
correlations are modelled in terms of quadratic correlations. This local model
uses five nondimensional parameters to describe the properties of the flow. We
attempt to determine these closure parameters for our simulations and find that
the model does produce qualitatively correct behaviour. In addition, we present
results concerning the shear rate dependency of the magnetic to kinetic energy
ratio. We find both the turbulent stress ratio and the total stress to be
strongly dependent on the shear rate.
