We propose a two-dimensional Kalman filter approach that, additional to the information contained in futures prices evolution over time, makes use of information contained in the term structure of commodity futures along a second dimension of maturities. This time-maturity surface reflects a...

A spatio-temporal model is proposed aimed at producing an index of housing prices. A hedonic model with geographically varying coefficients is coupled with a non parametric estimation of the trend, whence a price index is derived.

When working with time series data observed at intervals smaller than a year, it is often necessary to test for the presence of seasonal unit roots. One of the most widely used methods for testing seasonal unit roots is that of HEGY, which provides test statistics with non-standard...

The optimization of stochastic linear problems, via scenario analysis, based on Benders decomposition requires to appending feasibility and/or optimality cuts to the master problem until the iterative procedure reaches the optimal solution. The cuts are identified by solving the auxiliary...

This paper examines the various tests commonly used to select random parameters in choice modelling. The most common procedures for selecting random parameters are: the Lagrange Multiplier test as proposed by McFadden and Train (2000), the t-statistic of the deviation of the random parameter and...

We propose a two-stage procedure to estimate conditional beta pricing models that allow for flexibility in the dynamics of assets' covariances with risk factors and market prices of risk (MPR). First, conditional covariances are estimated nonparametrically for each asset and period using the...

In this paper we study solution methods for solving the dual problem corresponding to the Lagrangean Decomposition of two stage stochastic mixed 0-1 models. We represent the two stage stochastic mixed 0-1 problem by a splitting variable representation of the deterministic equivalent model, where...

A more recent version of this paper has been published as Working Paper Biltoki 2011.08.

Modern forms of energy are an important vehicle towards poverty alleviation in rural areas of developing countries. Most developing countries٠households heavily rely on wood fuel which impact their health and socialӥconomic status. To ease such a dependency, other modern forms of energy,...

In this paper I critically analyze Smith's thesis in book I, chapter 6 of the "Wealth of Nations" that the replacement of the capital goods consumed in production becomes fully income. I argue that Smithٳ argument is defective and does not imply this, and that, once it is properly corrected, it...