Central Economics and Mathematics Institute

About: Central Economics and Mathematics Institute is a facility organization based out in Moscow, Russia. It is known for research contribution in the topics: Population & Foreign-exchange reserves. The organization has 297 authors who have published 580 publications receiving 6449 citations. The organization is also known as: Federal State Institution of Science Central Economics and Mathematics Institute of the Russian Academy of Sciences.

Applied qualimetry: its origins, errors and misconceptions

Abstract: Purpose – The purpose of this paper is to provide the reader, who may have little or no knowledge of qualimetry, with first, an outline of the history and development of this relatively new scientific discipline, which deals with the methodology of and problems in the integral quantitative assessment of the quality of objects of any nature: things and processes, products of labour and products of nature, whether material or ideal, animate or inanimate, simple or complex, natural or man‐made, etc.; and second, the most common errors that occur in the design and application of quality assessment techniques, which result in the depreciation of findings obtained by these techniques, and methods for eliminating such errors.Design/methodology/approach – The methodology used to obtain the results described in the paper is based on a deductive‐axiomatic approach and, occasionally, on expert judgements.Findings – The findings presented in the paper can raise the research community's awareness of the great opportun...

Extended dynamic spin-fluctuation theory of metallic magnetism.

Abstract: A dynamic spin-fluctuation theory that directly takes into account nonlocality of thermal spin fluctuations and their mode-mode interactions is developed. The Gaussian approximation in the theory is improved by a self-consistent renormalization of the mean field and spin susceptibility due to the third-and fourth-order terms of the free energy, respectively. This eliminates the fictitious first-order phase transition, which is typical for the Gaussian approximation, and yields a proper second-order phase transition. The effect of nonlocal spin correlations is enhanced by taking into account uniform fluctuations in the single-site mean Green function. Explicit computational formulae for basic magnetic characteristics are obtained. The extended theory is applied to the calculation of magnetic properties of Fe-Ni Invar. Almost full agreement with experiment is achieved for the magnetization, Curie temperature, and local and effective magnetic moments.

Shortest-path feasibility algorithms: An experimental evaluation

Abstract: This is an experimental study of algorithms for the shortest-path feasibility problem: Given a directed weighted graph, find a negative cycle or present a short proof that none exists. We study previously known and new algorithms. Our testbed is more extensive than those previously used, including both static and incremental problems, as well as worst-case instances. We show that, while no single algorithm dominates, a small subset (including new algorithms) has very robust performance in practice. Our work advances the state of the art in the area.

Models for Moody’s Bank Ratings

Abstract: The paper presents an econometric study of the two bank ratings assigned by Moody's Investors Service. According to Moody’s methodology, foreign currency long-term deposit ratings are assigned on the basis of Bank Financial Strength Ratings (BFSR), taking into account “external bank support factors” (joint-default analysis, JDA). Models for the (unobserved) external support are presented, and we find that models based solely on public information can approximate the ratings reasonably well. It appears that the observed rating degradation can be explained by the growth of the banking system as a whole. Moody’s has a special approach for banks in developing countries in general and for Russia in particular. The models help reveal the factors that are important for external bank support.