This paper discusses the use of fractional exponential models (Robinson (1990), Beran (1994)) to model the spectral density f(x) of a covariance stationary process when f(x) may be decomposed as f(x) = x ?2d f (x), where f (x) is bounded and bounded away from zero. A form of log-periodogram regression technique is presented both in the parametric context (i.e. f (x) is a nite order exponential ...

We present a class of models for trend plus stationary component time series, in which the spectral densities of stationary components are represented via non-parametric smoothness priors combined with long-range dependence components. We discuss model tting and computational issues underlying Bayesian inference under such models, and provide illustration in studies of a climatological time ser...

forest and colleagues have persuasively made the case that policy capacity is a fundamental prerequisite to health reform. they offer a comprehensive life-cycle definition of policy capacity and stress that it involves much more than problem identification and option development. i would like to offer a canadian perspective. if we define health reform as re-orienting the health system from acut...