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FUZZY ECONOMIC REVIEW

ISSN (print) 1136-0593 · ISSN (online) 2445-4192

FUZZY ECONOMIC REVIEW, Volume XVIII

The permanence of the client under uncertain estimations

Ana María Gil Lafuente: University of Barcelona. Faculty of Economics

Mauricio Ortigosa Hernández: Anáhuac University. Faculty of Economics and Business

Marketing has studied the permanence of a client within an enterprise because it is a key element in the study of the value (economic) of the client (CLV). The research that they have developed is based in deterministic or random models, which allowed estimating the permanence of the client, and…
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Relationships between stakeholders and reports using fuzzy relations

Paula A. D´Onofrio: University of Buenos Aires

Inés García Fronti: University of Buenos Aires

The main parameter of the concept of corporate social responsibility is to consider the expectations of different stakeholders (employees, partners, customers, local communities, the environment, shareholders, vendors, etc.) regarding the behavior of companies. Even if a relatively homogeneous group is selected, as in this paper, differences are seen when establishing…
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Particle swarm optimization an alternative for parameter estimation in regression

Sergio G. de-los-Cobos-Silva: Autónoma Metropolitan Iztapalapa University

Antonio Terceño-Gómez: Rovira i Virgili University

Miguel Angel Gutiérrez-Andrade: Autónoma Metropolitan Iztapalapa University

Eric A. Rincón-García: Autónoma Metropolitan Azcapotzalco

Pedro Lara-Velázquez: Autónoma Metropolitan Azcapotzalco

Manuel Aguilar-Cornejo: Autónoma Metropolitan Iztapalapa University

The practice of applying curve fitting techniques to describe data is widespread in many fields: in biology, in medicine, in engineer, in economy, etc. This paper presents a heuristic technique named Particle Swarm Optimization to be used for parameter estimation in regression models. The algorithm was tested on 27 databases…
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Modeling queueing systems using fuzzy estimators

George N. Botzoris: Democritus University of Thrace

Basil K. Papadopoulos: Democritus University of Thrace

D.S. Sfiris: Democritus University of Thrace

Queuing modeling is the mathematical approach for the analysis of waiting lines. The central problem in every queueing model is a trade-off decision: The manager must weigh the added cost of providing more rapid service against the inherent cost of waiting. In this paper, a new fuzzy approach to queueing…
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An assessment of abnormal returns and risk in socially responsible firms using fuzzy alpha jensen and fuzzy beta

Klender Aimer Cortez Alejandro: Universidad Autónoma de Nuevo León, Facultad de Contaduría Pública y Administración

Martha del Pilar Rodríguez García: Universidad Autónoma de Nuevo León, Facultad de Contaduría Pública y Administración

Berenice Méndez Sáenz: Universidad Autónoma de Nuevo León, Facultad de Contaduría Pública y Administración

This study analyzes the differences in financial performance and risk between sustainable firms and non-sustainable firms through the use of a fuzzy Jensen’s alpha and a fuzzy beta to measure abnormal returns and systematic risk, respectively. The sample consisted of 644 firms from OECD countries: Australia, Denmark, Spain, US, Finland,…
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Financial responsibility. a temporal risk?

David Ceballos Hornero: Department of Economic, Financial and Actuarial Mathematics. Faculty of Economics and Business Administration, University of Barcelona

In Finance, when the context is particularly complex responsibility can be “invisible” from the perspective afforded by time. Hence, temporal risk can usefully be analyzed through the Greek concepts of time: Chronos (god of duration and sequential time), Kairos (god of opportunity and the moment of time) and Aeon (god…
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