In this paper we develop a semi-Markov formulation for modelling transitions of physicians, nurse practitioners, and physician assistants between different settings and locations within a geographic area. The model predicts the supply of primary care providers over a planning horizon. We then...

The Federal Reserve sets targets for interest rates which it enforces through direct market intervention. These targets are changed periodically. In this paper, we develop a term structure model in which the short rate is subject to a control which keeps it close to a target which changes from...

Conditions are given on a family of measures {[mu]a, 0[less-than-or-equals, slant]a[less-than-or-equals, slant]1} so that the corresponding family {Aat, 0[less-than-or-equals, slant]a[less-than-or-equals, slant]1} of additive functionals of d-dimensional Brownian motion will be jointly...

A simple proof is given of the representation of martingales adapted to the sigma fields of a process with stationary, independent increments.