99 citations · 219 across the 19 of their papers we have counts for
19 papers
Data envelopment analysis with common-denominator ratio variables: An application to education with methodological extensions
Vicente J. Bolós, Víctor J. España, Rafael Benítez +1
The use of ratio variables in convex Data Envelopment Analysis (DEA) models has long been recognized as a methodological issue, as ratios may be incompatible with the convexity ass…
Biarchetype analysis for univariate functional data. An application to macroeconomic financial time series
Aleix Alcacer, Rafael Benitez, Vicente J. Bolos +1
We introduce biarchetype analysis for the first time in the context of univariate functional data. This unsupervised methodology extends archetype analysis by simultaneously identi…
Archetypal analysis of European 10-year government bond yields with multidimensional scaling of two-mode three-way asymmetric dissimilarities
Aleix Alcacer, Rafael Benitez, Vicente J. Bolos +1
A recent methodology for extracting archetypal profiles from three-way asymmetric proximity data is applied to a dataset comprising 23 x 23 x 3 two-mode, three-way asymmetric dissi…
A new family of models with generalized orientation in data envelopment analysis
V. J. Bolos, R Benitez, V. Coll-Serrano
In the framework of data envelopment analysis, we review directional models \citep{Chambers1996, Chambers1998, Briec1997} and show that they are inadequate when inputs and outputs…
Multidimensional scaling of two-mode three-way asymmetric dissimilarities: finding archetypal profiles and clustering
Mireia Mollar-Gumbau, Aleix Alcacer, Rafael Benitez +2
Multidimensional scaling visualizes dissimilarities among objects and reduces data dimensionality. While many methods address symmetric proximity data, asymmetric and especially th…
Conventional and Fuzzy Data Envelopment Analysis with deaR
Vicente J. Bolos, Rafael Benitez, Vicente Coll-Serrano
deaR is a recently developed R package for data envelopment analysis (DEA) that implements a large number of conventional and fuzzy models, along with super-efficiency models, cros…
Interdependence between Green Financial Instruments and Major Conventional Assets: A Wavelet-Based Network Analysis
Roman Ferrer, Rafael Benitez, Vicente J. Bolos
This paper examines the interdependence between green financial instruments, represented by green bonds and green stocks, and a set of major conventional assets, such as Treasury,…
Continuous models combining slacks-based measures of efficiency and super-efficiency
Vicente J. Bolos, Rafael Benitez, Vicente Coll-Serrano
In the framework of data envelopment analysis (DEA), Tone (2001) introduced the slacks-based measure (SBM) of efficiency, which is a nonradial model that incorporates all the slack…
Chance constrained directional models in stochastic data envelopment analysis
Vicente J. Bolos, Rafael Benitez, Vicente Coll-Serrano
We construct a new family of chance constrained directional models in stochastic data envelopment analysis, generalizing the deterministic directional models and the chance constra…
wavScalogram: an R package with wavelet scalogram tools for time series analysis
Vicente J. Bolos, Rafael Benitez
In this work we present the wavScalogram R package, which contains methods based on wavelet scalograms for time series analysis. These methods are related to two main wavelet tools…
nlstac: Non-Gradient Separable Nonlinear Least Squares Fitting
J. A. F. Torvisco, R. Benítez, M. R. Arias +1
A new package for nonlinear least squares fitting is introduced in this paper. This package implements a recently developed algorithm that, for certain types of nonlinear curve fit…
Reputation analysis of news sources in Twitter: Particular case of Spanish presidential election in 2019
Aarón López-García, Rafael Benítez
Fake news are affecting a large proportion of the population even becoming a danger to the society. Mostly, this disinformation flow take place through Internet. Being aware of tha…
Quantifying non-periodicity of non-stationary time series through wavelets
Vicente J. Bolos, Rafael Benitez, Roman Ferrer
In this paper, we introduce a new wavelet tool for studying the degree of non-periodicity of time series that is based on some recently defined tools, such as the \textit{windowed…
A probabilistic model for crystal growth applied to protein deposition at the microscale
V. J. Bolós, R. Benítez, A. Eleta-López +1
A probabilistic discrete model for 2D protein crystal growth is presented. This model takes into account the available space and can describe growing processes of different nature…
Existence and uniqueness of nontrivial collocation solutions of implicitly linear homogeneous Volterra integral equations
Vicente J. Bolós, Rafael Benítez
We analyze collocation methods for nonlinear homogeneous Volterra-Hammerstein integral equations with non-Lipschitz nonlinearity. We present different kinds of existence and unique…
Blow-up collocation solutions of nonlinear homogeneous Volterra integral equations
Vicente J. Bolós, Rafael Benítez
In this paper, collocation methods are used for detecting blow-up solutions of nonlinear homogeneous Volterra-Hammerstein integral equations. To do this, we introduce the concept o…
Nonconvolution nonlinear integral Volterra equations with monotone operators
M. R. Arias, R. Benítez, V. J. Bolós
Some results about existence, uniqueness, and attractive behaviour of solutions for nonlinear Volterra integral equations with non-convolution kernels are presented in this paper.…
Invariant manifolds of the Bonhoeffer-van der Pol oscillator
R. Benítez, V. J. Bolós
The stable and unstable manifolds of a saddle fixed point (SFP) of the Bonhoeffer-van der Pol oscillator are numerically studied. A correspondence between the existence of homoclin…
A wavelet-based tool for studying non-periodicity
R. Benítez, V. J. Bolós, M. E. Ramírez
This paper presents a new numerical approach to the study of non-periodicity in signals, which can complement the maximal Lyapunov exponent method for determining chaos transitions…