Fernando Ant López Hernández

Fernando Ant López Hernández
Universidad Politécnica de Cartagena | UPCT · Departamento de Métodos Cuantitativos e Informáticos

Mathematics

About

121
Publications
19,977
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1,039
Citations
Citations since 2016
40 Research Items
727 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Additional affiliations
January 1992 - present
Universidad de Cartagena
Position
  • Professor (Full)
February 1940 - present
Universidad Politécnica de Cartagena
Position
  • Professor (Associate)

Publications

Publications (121)
Article
Infrastructure networks, including transportation, telecommunications, and energy grids, are essential for the correct functioning of many economic and social processes. Considering the import of networked critical infrastructure, it is clear that understanding the characteristics of networks that make them vulnerable to disruption is a valuable en...
Article
Numerous studies investigate the topic of industrial agglomeration, and in particular of localization economies that give rise to patterns of geographical clustering of firms. These studies have employed different indicators useful to assess a sector's degree of geographic clustering, or to characterize the nature of the scale on which localization...
Article
We evaluate the usefulness of the spatial scan test in specification testing for spatial econometric models. The null hypothesis assumes equality of the mean values of a variable in all the locations of a geo-referenced data set. The alternative hypothesis relies on the existence of one (or more) spatial cluster(s) where mean values differ from tho...
Article
Full-text available
A key function of local governments is to provide a wide array of public services. The supply of these services has been found to create spatial spillovers among neighbouring municipalities. Although it is generally agreed that spillovers are present in models that explain government expenditures, their type—whether endogenous, exogenous or residua...
Article
Full-text available
López et al. (Reg Sci Urban Econ 40(2–3):106–115, 2010) introduce a nonparametric test of spatial dependence, called SG(m). The test is claimed to be consistent and asymptotically Chi-square distributed. Elsinger (Reg Sci Urban Econ 43(5):838–840, 2013) raises doubts about the two properties. Using a particular counterexample, he shows that the asy...
Article
Creative clusters are increasingly being recognized as vital tools in the promotion of the competitiveness, innovation, urban development, and growth of cities in developed countries. This paper studies the geography of Cultural and Creative Industries (CCIs) in Barcelona (Spain) for the years 2009 and 2017. We investigate the spatial distribution...
Article
This paper presents a test based on the principle of Lagrange Multipliers to identify spatial instability in the constant coefficient of regression models including substantive spatial dependence. The test has been adapted to the Scan methodology. Its main advantage is that it identifies areas with differential behavior without the need to provide...
Article
Full-text available
A novel general method for constructing nonparametric hypotheses tests based on the field of symbolic analysis is introduced in this paper. Several existing tests based on symbolic entropy that have been used for testing central hypotheses in several branches of science (particularly in economics and statistics) are particular cases of this general...
Article
Este estudio examina la influencia de los efectos espaciales sobre el crecimiento de la productividad de la Pyme industrial española. Para desarrollar este trabajo usamos una muestra de 35.042 empresas segmentada en función de la tecnología del sector para el periodo 1996-2004. Con el objetivo de analizar la relación espacio-crecimiento utilizamos...
Chapter
We apply spatio-temporal scan statistics on the distributions of asking price per meter squared for various segments of the housing market (attics, houses, flats of various sizes) in the city of Madrid for 5 years during the period 2008–2019. Our application shows how spatio-temporal scan statistics can be useful for assessing the dynamics of urban...
Article
Full-text available
Introduction Urban air pollution (UAP) is a major threat to child and adolescent health. Children are more vulnerable to its effects, being associated with higher morbidity and mortality due to acute and chronic diseases, especially respiratory ones. A study is performed on the relationship between UAP and the rate of hospital admissions due to acu...
Article
Background Childhood cancer is a chronic disease with high survival rates. Childhood cancer survivors (CCS) can still face health effects later in their lives. Health-related quality of life (HRQoL) and the factors that modify it allow CCS and their families to improve care in the long-term follow-up. This study aims to: (1) examine the differences...
Article
The novel SARS‐CoV2 has disrupted health systems and the economy, and public health interventions to slow its spread have been costly. How and when to ease restrictions to movement hinges in part on whether SARS‐CoV2 will display seasonality due to variations in temperature, humidity, and hours of sunshine. Here, we address this question by means o...
Article
Full-text available
The novel SARS-CoV2 has disrupted health systems and the economy, and public health interventions to slow its spread have been costly. How and when to ease restrictions to movement hinges in part on whether SARS-CoV2 will display seasonality due to variations in temperature, humidity, and hours of sunshine. Here, we address this question by means o...
Article
This paper presents evidence of the significant role that geography plays in customer churn behavior in online retail. In an urban environment, mimetic behaviors are found to affect nearby individuals. This novel approach is based on the idea that customer churn is not randomly distributed across the map. This paper analyzes more than 2,000 spatial...
Article
Full-text available
In recent decades we have seen an increased interest in the use of seemingly unrelated regressions models (SUR) in a spatial context, with compelling case studies in different fields. This upsurge has favoured the development of new and more efficient inference techniques. At present, the user has a basic toolkit to deal with this kind of model, th...
Article
Full-text available
The aim of this paper is to develop a spatial group-wise heteroskedasticity test based on the scan approach, specifically developed for spatial autocorrelation regression models (spatial lag and spatial error models): the “scan-LM test.” Based on the Lagrange multiplier (LM) principle, its main advantage lies in its comparative ease of implementati...
Article
Full-text available
Resumen Introducción La contaminación atmosférica urbana es una amenaza principal para la salud infantojuvenil. Los niños son más vulnerables a sus efectos asociando mayor morbimortalidad de enfermedades agudas y crónicas, especialmente respiratorias. Pretendemos estudiar los efectos de la contaminación atmosférica urbana en la tasa de ingresos ho...
Article
Maternal alcohol consumption during pregnancy is responsible for negative health outcomes. The literature shows that socio-economic and lifestyle factors are both related with alcohol consumption during pregnancy; nevertheless, the role of other factors is unclear. The objective of this study is to assess the role that partners' alcohol consumption...
Article
Aims: In current clinical practice, prenatal alcohol exposure is usually assessed by interviewing the pregnant woman by applying questionnaires. An alternative method for detecting alcohol use is to measure the biomarker carbohydrate-deficient transferrin (CDT). However, few studies measure CDT during pregnancy. This study examines the utility of...
Article
Full-text available
Background: The 5-year overall survival (OS) in childhood acute lymphoblastic leukemia (ALL) has reached 90% in high-income countries, levels that can no be longer overcome with strategies based on intensification of treatment. Other approaches in the search for new and modifiable prognostic factors are necessary to continue to improve these rates...
Article
Full-text available
In a world that is increasingly technological and interconnected, but also more violent, overexploited and polluted, Paediatric Environmental Health (PEH) is one of the best contributions to improve global health. Few areas of the planet have a high affinity with common values and interests, such as the European Union (EU), Latin America and the Ca...
Article
Full-text available
En un mundo cada vez más tecnológico e interconectado, pero también más violento, esquilmado y contaminado, la salud medioambiental pediátrica (SMAP) constituye una de las mejores contribuciones para mejorar la salud global. Pocas zonas del planeta tienen una afinidad tan alta en valores e intereses como la Unión Europea (UE), América Latina y el C...
Article
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Decision Trees (DTs) are a machine learning technique widely used for regression and classification purposes. Conventionally, the decision boundaries of Decision Trees are orthogonal to the features under consideration. A well-known limitation of this is that the algorithm may fail to find optimal partitions, or in some cases any partitions at all,...
Article
Geography has previously been noted as a decisive factor in business literature. This paper provides evidence of the significant role geography plays in customer lapse behaviour in an urban environment. This novel approach is based on the idea that the customers who cancel all policies and leave the company are not randomly distributed; rather, a m...
Article
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Geography has been considered a decisive factor in different fields of business-related research. This paper provides some evidence concerning the role of geography on business failure in urban environments. The paper use spatial econometric methodology to evaluate the impact of the geographical location of external economic agents on the probabili...
Article
Full-text available
Background: Obesity is a major public health crisis among both children and adults and contributes to significant physical, psychological, and economic burden. We aim to investigate the effect of duration of breastfeeding on excessive weight and obesity at 6 years of age. Subjects/methods: Data on breastfeeding and child anthropometric measureme...
Article
The paper highlights the role played by nonlinearities and geographical proximity in an attempt to better understand the financial behaviour of firms. Our study focuses on three main financial dimensions: profitability, indebtedness and liquidity. A classical partial adjustment model is specified in order to capture the movements produced in each d...
Article
Full-text available
We propose a scan test for the presence of spatial groupwise heteroskedasticity in cross-sectional data. The scan approach has been used in different fields before, including spatial econometric models, to detect instability in mean values of variables or regression residuals. In this paper, we extend its use to second order moments. Using large Mo...
Article
Full-text available
Our research constitutes an advancement and attempts to answer an important question on basketball metrics: how to measure regularity in terms of points scored and which factors may influence this regularity. This question has been understudied in the specialised literature despite its importance. We employed the median absolute deviation (MAD) as...
Article
Full-text available
Aim: Pediatric cancer has been associated with exposure to certain environmental carcinogens. The purpose of this work is to analyse the relationship between environmental pollution and pediatric cancer risk. Method: We analysed all incidences of pediatric cancer (<15) diagnosed in a Spanish region during the period 1998-2015. The place of resid...
Article
Background: Leukaemia remains the most common type of paediatric cancer and its aetiology remains unknown, but considered to be multifactorial. It is suggested that the initiation in utero by relevant exposures and/or inherited genetic variants and, other promotional postnatal exposures are probably required to develop leukaemia. This study aimed...
Article
Recent research into corporate finances has found that the financial decisions of peer companies are related. Companies tend to “kept an eye” on the decisions of other peer companies, among other things, trying to overcome the limitations caused by the lack of information. This paper further examines these interactions including geographical proxim...
Article
Full-text available
This paper aims to contrast the spillover effects in business failure derived from the geographic proximity among firms of the same sector. To get this purpose, we develop an empirical application based on the analysis of the join-count statistics on a sample of firms of service sector located in the municipality of Murcia (Spain). Our results show...
Article
Full-text available
This paper tests the role of spillover effects derived from the geographic proximity among reduced size firms in business failure. To get this purpose, we develop an empirical application on a sample of 2.710 Spanish Small, Medium size Enterprises (SMEs) located in the region of Murcia. With this information, we estimate a spatial probit regression...
Article
A key function of local governments is to provide a wide array of public services. The supply of these services has been found to create spatial spillovers among neighbouring municipalities. Although it is generally agreed that spillovers are present in models that explain government expenditures, their type—whether endogenous, exogenous or residua...
Article
Full-text available
This paper evaluates the integration of mobile devices for learning proposes and identifies those factors that influence the adoption of this technology in higher education. A sample of 411 students participated in the research. The data was analysed using two models of technology adoption (TAM and UTAUT) including socio-demographic indicators. The...
Article
Counter-knowledge refers to flaws in citizens' mental models arising from utilization of rumours, inappropriate knowledge structures, outdated routines or procedures. When counter-knowledge is applied to civil servants, it may result in problems of efficiency, equity and motivation. This paper examines the relationship between counter-knowledge and...
Article
Counter-knowledge refers to flaws in citizens' mental models arising from utilization of rumours, inappropriate knowledge structures, outdated routines or procedures. When counter-knowledge is applied to civil servants, it may result in problems of efficiency, equity and motivation. This paper examines the relationship between counter-knowledge and...
Article
Objective: To assess attitudes, beliefs and knowledge of primary medical care professionals as regards the follow-up of Childhood Cancer Survivors (CCS) and the introduction of a Long-Term Follow-Up Program for Childhood Cancer Survivors in the Region of Murcia (PLASESCAP-MUR). Material and methods: Descriptive cross-sectional study using a stru...
Article
Occasionally, primary care pediatricians notice the presence of small clusters of pediatric cancer (PC), but are often frustrated by the findings after statistical analysis. The study of small areas in spatial epidemiology has led to advances in identifying clusters and the environmental risk factors involved. The purpose of this study was to descr...
Article
The main funding source of cultural, sports and recreational activities comes from local governments. The supply of these services creates spillovers between neighboring municipalities. Literature has shown many examples of spatial dependence in spending levels in these budgetary items at small local governments. Although there is general agreement...
Article
To assess attitudes, beliefs and knowledge of primary medical care professionals as regards the follow-up of Childhood Cancer Survivors (CCS) and the introduction of a Long-Term Follow-Up Program for Childhood Cancer Survivors in the Region of Murcia (PLASESCAP-MUR).
Article
The main funding source of cultural, sports and recreational activities comes from local governments. The supply of these services creates spillovers between neighboring municipalities. Literature has shown many examples of spatial dependence in spending levels in these budgetary items at small local governments. Although there is general agreement...
Chapter
This volume brings together leading researchers from the United States, UK, and Europe to explore the processes that lead to segregation, and the outcomes and implications that follow. Making use of new methods and data sources that can offer fresh perspectives on segregation in different contexts, the book considers how the spatial patterning of s...
Article
The purpose of the paper was to compare two well-known model selection strategies, the so-called Specific-to-General, Stge, and General-to-Specific, Gets, in a context of spatial SUR models. The two strategies use a battery of misspecification tests obtained in a maximum likelihood framework. The robust tests to local misspecification errors in the...
Chapter
Introduction Segregation, the preferred or imposed separation of individuals in space and/or time, is a phenomenon observed for several traits of self-identity and labelling, including ethnicity, language, religion and economic status. Urban segregation is as old as the history of cities, with evidence indicating that it was practised in such dispa...
Article
In this research we study the relationship between concentration of scoring production (measured with the Gini index of team points) and teams’ offensive efficiency (measured as normalised team points per minutes played and possessions) in the game of basketball. We record the aggregate box-score statistics of all teams from the 1977/1978 to the 20...
Article
In this research we study the relationship between concentration of scoring production (measured with the Gini index of team points) and teams' offensive efficiency (measured as normalised team points per minutes played and possessions) in the game of basketball. We record the aggregate box-score statistics of all teams from the 1977/1978 to the 20...
Article
Full-text available
Mobile devices are everywhere to be found on university campuses. This has changed the nature of higher education and led to a new mobile form of e-learning known as m-learning. The aim of this article is to assess the penetration of mobile devices for learning purposes in higher education and to identify the main usage patterns. To that end, the s...
Article
Full-text available
This paper evaluates the behaviour of different families of tests when checking for spatial independence in the presence of nonlinearities. To reach this goal, we select three representative proposals. The usual parametric tests of I-Moran, the nonparametric proposal of Brett and Pinkse (1997), and the semiparametric Scan test. In order to study ho...
Article
Discrete choice models are increasingly implemented using geographical data. When this is the case, it may not be sufficient to project market shares accurately, but also to correctly replicate the spatial pattern of choices. Analysts might then be interested in assessing the results of a model’s fit relative to the spatial distribution of the obse...
Article
Full-text available
The importance of quantitative analysis in sports using objective data (such as game statistics), has been had prominent in recent years. In this paper we have shown an application of spatial statistics to understand more thoroughly the game of basketball. This methodology has been rarely used in sports research, specifically in basketball. We have...
Article
This paper analyses a second-order polynomial spatial structure in the residues of a regression model. We propose a new specification that captures spatial dependence on two different levels, adding a new autoregressive cycle to the errors of the classical spatial error model (SEM). The inference problems of the parameters are solved by means of ma...
Article
Full-text available
This paper evaluates the behaviour of different families of tests when checking for spatial independence in the presence of nonlinearities. To reach this goal, we select three representative proposals. The usual parametric tests of I-Moran, the nonparametric proposal of Brett and Pinkse (1997), and the semiparametric Scan test. In order to study ho...
Article
Congenital fibrosarcoma (CFS) is a rare fibrous tissue malignancy that usually presents in the first few years of life. It is unique among human sarcomas in that it has an excellent prognosis. We describe a temporal clustering of a number of cases of CFS and investigate the possible associated prenatal risk factors. The Pediatric Environmental Hist...
Article
The aim of this paper is to put forward a beta convergence model using spatial interaction to evaluate the dynamics of financial ratios. We overcome some of the limitations that come from the traditional partial adjustment model by relating both models. We show that the parameters of the two models may be connected. As an example, we discuss the ca...
Chapter
Concentration of economic activity constitutes a stylized fact of social sciences, giving birth to a very fertile branch of research since the writings of Marshall until today. Many researchers have been working on how to measure and explain concentration patterns of activity, trying to face that challenge and transpose it to a tractable argument i...
Article
It is relatively easy to find symptoms of misspecification in a model that suffers from instability. Problems arise in relation to their interpretation: They may be due to a wrong selection of the functional form. There may be a problem of omitted variables or the parameters of the model may not be homogeneous across space. The authors focus their...
Article
Full-text available
Comparison of thematic maps is an important task in a number of disciplines. Map comparison has traditionally been conducted using cell-by-cell agreement indicators. More recently, other methods have been proposed that take into account not only spatially coincident cells in two maps, but also their surroundings or the spatial structure of their di...
Article
Full-text available
The study of population patterns has animated a large body of urban social research over the years. An important part of this literature is concerned with the identification and measurement of segregation patterns. Recently, emphatic calls have been made to develop measures that are better able to capture the geography of population patterns. The o...
Technical Report
Full-text available
En este trabajo se analiza la concentración espacial de las empresas pertenecientes a los sectores industrial y de servicios ubicados en el Valle del Ebro, atendiendo a sus niveles de productividad. El periodo que utilizamos es 1996 a 2009. Los resultados obtenidos nos permiten valorar el impacto del entorno socioeconómico y geográfico del Valle de...
Article
Full-text available
Accounting for spatial structures in econometric studies is becoming an issue of special interest, given the presence of spatial dependence and spatial heterogeneity problems arising in data. Generally, researchers have been employing parametric tests for detecting spatial dependence structures: Moran’s I and LM tests in spatial regressions are the...
Article
This paper tries to extend the range of techniques for testing the hypothesis of ‘complete spatiotemporal randomness’ in the case of a general type variable with a regional or spatial breakdown. The tests that we can find nowadays in the literature are not well‐suited to, for the most part of, series of interest. We have generalized the use of thre...
Article
The aims of this study are the following: first, to analyze incidence, trends, and survival of nervous system tumors in children under the age of 15 in the Region of Murcia, Spain, during the years 1998-2009 and second, to evaluate if certain environmental exposures may be involved in the etiology of childhood nervous system tumors. The study was p...
Chapter
The purpose of the study is to investigate dynamics across provinces and time causing Spanish pharmaceutical expenditure to increase. Adjustment for residual correlation across time periods and residual variance instability is shown to be essential. Presence of parametric instability is captured using linear time trends in the coefficients. Control...
Article
Introduction: Environment and Paediatric Cancer (PC) in the Region of Murcia (RM) is an on-going research project that has the following aims: to collect a careful paediatric environmental history (PEH) and to use geographical information systems (GIS) to map the incidence and analyze the geographic distribution of the PC incidence in the RM. The...
Article
Environment and Paediatric Cancer (PC) in the Region of Murcia (RM) is an on-going research project that has the following aims: to collect a careful paediatric environmental history (PEH) and to use geographical information systems (GIS) to map the incidence and analyze the geographic distribution of the PC incidence in the RM. The objectives are...
Article
Full-text available
The paper focuses on the case of a panel data set, without unobserved individual effects, treated by means of an SUR specification. The problem raised is to test for the presence of spatial effects in these multivariate systems. Various useful tests are developed based on the principle of the Lagrange Multiplier in a maximum-likelihood framework. A...
Article
This paper focuses on the hypothesis of stability in the mechanisms of spatial dependence that are usually employed in spatial econometric models. We propose a specification strategy for which the first step is to solve a local estimation algorithm, called the Zoom estimation. The aim of this stage is to detect problems of heterogeneity in the para...
Article
Full-text available
Qualitative spatial variables are important in many fields of research. However, unlike the decades-worth of research devoted to the spatial association of quantitative variables, the exploratory analysis of spatial qualitative variables is relatively less developed. The objective of the present paper is to propose a new test (Q) for spatial indepe...
Article
Full-text available
Research in spatial econometrics has undergone a very intense increase in recent decades, both quantitatively and qualitatively. The indicators usually employed, such as published articles, handbooks and volumes edited and conferences and workshops organized, offer a robust image of this fast development. Another, and perhaps more important, aspect...
Article
In the present paper, we construct a new, simple, consistent and powerful test for spatial independence, called the SG test, by using the new concept of symbolic entropy as a measure of spatial dependence. The standard asymptotic distribution of the test is an affine transformation of the symbolic entropy under the null hypothesis. The test statist...
Article
A regression model for per capita public pharmaceutical expenditure, based on aggregate data from fifty Spanish provinces, observed annually for the period 1996–2002 is analyzed. The necessity of simultaneously controlling for dynamic patterns and spatial autocorrelation is demonstrated. As the aim of the present and related studies of small-area v...
Article
Full-text available
Our paper focuses on the case of SUR models with spatial effects. Specifically, the problem that we pose is testing for the presence of spatial effects in these multivariate models, considering that one of our main interests is to deal with the question of selecting the most adequate specification for the data. In order to do this, we obtain severa...