Understanding the impact of various factors on train arrival delays is a prerequisite for effective railway traffic operating control and management. Existing studies analyze delay using single, generic regression equation, restricting their capability in accounting heterogeneous impacts spatiotemporal as travels along its route. The paper proposes set equations conditional location analyzing a...

in this study the consumption behavior of iranian urban households is analyzed for the eight main food commodities groups including cereal and its products, meat, milk and its products and eggs, fruits and vegetables, edible oils and butter, beverages, grains and nuts over 1974-2007. in this context, the flexible demand models such as quadratic expenditure, rotterdam, almost ideal demand system...

In this paper we prove an existence and regularity theorem for la-grangian tori minimizing the Willmore functional in Euclidean four-space, R4 ,with the standard metric and symplectic structure. Technical difficulties arisebecause the Euler-Lagrange equation for this problem is a sixth-order nonlinearpartial differential equation. This research was motivated by a study of the<lb...

Seemingly unrelated regression (SUR) models traditionally appear in econometrics but recently also emerged in likelihood factorizations of Gaussian graphical models. The literature on maximum likelihood estimation in SUR seems not to mention the possibility of a multimodallikelihood. \eVe want to increase the awareness of this phenomenon by a thorough study of a two-equation model illustrated b...