macroeconomic time series. The coincident economic indicator is based on a multivariate trend-cycle decomposition model that … accounts for time variation in macroeconomic volatility, known as the great moderation. In particular, we consider an … unobserved components time series model with a common cycle that is shared across different time series but adjusted for phase …

distributions. We allow for stochastic volatility by modeling the variance as a stochastic function of time, with intra-day periodic …

In most multi-item inventory systems, the ordering costs consist of a major cost and a minor cost for each item … included. Applying for every individual item a cyclic inventory policy, where the cycle length is a multiple of some basic … cycle time, reduces the major ordering costs. An efficient algorithm to determine the optimal policy of this type is …

In this paper an inventory model with several demand classes, prioritised according to importance, is analysed. We … consider a lot-for-lot or (S-1,S) inventory model with lost sales.For each demand class there is a critical stock level at and … generally distributed lead time we derive expressions for the service levels for each demand class and the average total cost …

This paper proposes an alternative, dynamic framework for estimatingtime-varying values of travel time savings and … values of schedule delay, in whichtime-preferences are represented as the time-varying excess willingness to pay(EWPT) to … being in the one location, over being elsewhere. It is shown how theconventional linear model, with time-independent values …

Most evidence of hyperbolic discounting is based on violations of either stationarity or time consistency as observed … in choice experiments. These choice reversals may however also result from time-varying discount rates. Hyperbolic … discounting is a plausible explanation for choice reversals only if violations of stationarity and time consistency overlap. Our …