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38 Results Found

  • Article
  • Open Access
15 Citations
3,614 Views
17 Pages

Analysis of Madrid Metro Network: From Structural to HJ-Biplot Perspective

  • E. Frutos Bernal,
  • A. Martín del Rey and
  • P. Galindo Villardón

17 August 2020

With the growth of cities, urban traffic has increased and traffic congestion has become a serious problem. Due to their characteristics, metro systems are one of the most used public transportation networks in big cities. So, optimization and planni...

  • Article
  • Open Access
20 Citations
3,679 Views
16 Pages

Using HJ-Biplot and External Logistic Biplot as Machine Learning Methods for Corporate Social Responsibility Practices for Sustainable Development

  • Joel A. Martínez-Regalado,
  • Cinthia Leonora Murillo-Avalos,
  • Purificación Vicente-Galindo,
  • Mónica Jiménez-Hernández and
  • José Luis Vicente-Villardón

14 October 2021

In recent years, social responsibility has been revolutionizing sustainable development. After the development of new mathematical techniques, the improvement of computers’ processing capacity and the greater availability of possible explanatory vari...

(This article belongs to the Special Issue Multivariate Statistics: Theory and Its Applications)
  • Article
  • Open Access
22 Citations
4,128 Views
15 Pages

Trends in Agroforestry Research from 1993 to 2022: A Topic Model Using Latent Dirichlet Allocation and HJ-Biplot

  • Karime Montes-Escobar,
  • Javier De la Hoz-M,
  • Mónica Daniela Barreiro-Linzán,
  • Carolina Fonseca-Restrepo and ,
  • Miguel Ángel Lapo-Palacios,
  • Douglas Andrés Verduga-Alcívar and
  • Carlos Alfredo Salas-Macias
  • + 2 authors+ 0 author

11 May 2023

Background: There is an immense debate about the factors that could limit the adoption of agroforestry systems. However, one of the most important is the generation of scientific information that supports the viability and benefits of the proposed te...

(This article belongs to the Special Issue Multivariate Statistical Analysis and Application)
  • Article
  • Open Access
20 Citations
4,100 Views
15 Pages

Frequency of Neuroendocrine Tumor Studies: Using Latent Dirichlet Allocation and HJ-Biplot Statistical Methods

  • Karime Montes Escobar,
  • José Luis Vicente-Villardon,
  • Javier de la Hoz-M,
  • Lelly María Useche-Castro and ,
  • Daniel Fabricio Alarcón Cano and
  • Aline Siteneski
  • + 1 author+ 0 author

16 September 2021

Background: Neuroendocrine tumors (NETs) are severe and relatively rare and may affect any organ of the human body. The prevalence of NETs has increased in recent years; however, there seem to be more data on particular types, even though, despite th...

(This article belongs to the Special Issue Multivariate Statistics: Theory and Its Applications)
  • Article
  • Open Access
17 Citations
3,466 Views
17 Pages

20 July 2022

This work objective is to generate an HJ-biplot representation for the content analysis obtained by latent Dirichlet assignment (LDA) of the headlines of three Spanish newspapers in their web versions referring to the topic of the pandemic caused by...

(This article belongs to the Special Issue Multivariate Statistics: Theory and Its Applications)
  • Systematic Review
  • Open Access
11 Citations
4,239 Views
35 Pages

HJ-BIPLOT: A Theoretical and Empirical Systematic Review of Its 38 Years of History, Using Text Mining and LLMs

  • Roberto Cascante-Yarlequé,
  • Purificación Galindo-Villardón,
  • Fabricio Guevara-Viejó,
  • José Luis Vicente-Villardón and
  • Purificación Vicente-Galindo

7 June 2025

The HJ-Biplot, introduced by Galindo in 1986, is a multivariate analysis technique that enables the simultaneous representation of rows and columns with high-quality visualization. This systematic review synthesizes findings from 121 studies on the H...

(This article belongs to the Special Issue Multivariate Statistical Analysis and Application)
  • Article
  • Open Access
433 Views
43 Pages

29 August 2026

The rapid convergence of artificial intelligence, machine learning, and financial and risk analytics has produced a large and fragmented body of scientific literature, making it difficult to identify its thematic structure and evolutionary trends. Th...

(This article belongs to the Special Issue AI and Machine Learning in the Big Data Era: Advanced Algorithms and Real-World Applications)
  • Article
  • Open Access
1,054 Views
16 Pages

16 May 2026

Monitoring ambient air quality is essential for assessing environmental conditions and examining relationships among pollution indicators. This study presents a cross-sectional comparative analysis of key air quality indicators (PM2.5, O3, NO2, SO2,...

  • Article
  • Open Access
10 Citations
2,835 Views
16 Pages

Analyzing Malware Propagation on Wireless Sensor Networks: A New Approach Using Queueing Theory and HJ-Biplot with a SIRS Model

  • Elisa Frutos-Bernal,
  • Miguel Rodríguez-Rosa,
  • María Anciones-Polo and
  • Ángel Martín-del Rey

31 December 2023

Most research on malware focuses mainly on its detection, without paying attention to its propagation trends. However, modeling the spread of malware is an important research problem because it allows us to predict how malware will evolve and to take...

  • Review
  • Open Access
7 Citations
5,732 Views
23 Pages

Depression and Anxiety in Patients with Psoriasis: A Comprehensive Analysis Combining Bibliometrics, Latent Dirichlet Allocation, and HJ-Biplot

  • Aline Siteneski,
  • Karime Montes-Escobar,
  • Javier de la Hoz-M,
  • German Josuet Lapo-Talledo and ,
  • Geovanna Gutiérrez Moreno,
  • Esther Carlin Chavez,
  • Rosangela Caicedo Quiroz and
  • Gulnara Patricia Borja-Cabrera
  • + 3 authors+ 0 author

20 February 2025

Background: Patients with psoriasis often experience psychiatric comorbidities, such as depression and anxiety. These comorbidities can lead to poorer adherence to treatment regimens, reduced effectiveness of therapies, and a heightened disease burde...

(This article belongs to the Section Chronic Care)
  • Review
  • Open Access
350 Views
32 Pages

Microplastics Bioaccumulation and Trophic Transfer Research (2010–2025): A Bibliometric Analysis Using LDA and HJ-Biplot

  • Karime Montes-Escobar,
  • Emilio Jarre-Castro,
  • Javier de la Hoz-M,
  • Carlos Alfredo Salas-Macias and ,
  • José Macias-Barberán,
  • Frank Intriago-Flor,
  • Carolina Fonseca-Restrepo and
  • Jean Carlos Pérez-Parra
  • + 3 authors+ 0 author

The proliferation of microplastics and nanoplastics is a global environmental challenge, particularly because of their biological uptake, bioaccumulation, biomagnification, and trophic transfer across ecosystems. This study presents a bibliometric an...

(This article belongs to the Topic Microplastics Across Ecosystems: Multidisciplinary Approaches to Sources, Sinks and Health Sustainable Solutions)
  • Article
  • Open Access
18 Citations
6,488 Views
13 Pages

The Compositional HJ-Biplot—A New Approach to Identifying the Links among Bioactive Compounds of Tomatoes

  • Marcos Hernández Suárez,
  • Daniel Molina Pérez,
  • Elena M. Rodríguez-Rodríguez,
  • Carlos Díaz Romero and ,
  • Francisco Espinosa Borreguero and
  • Purificación Galindo-Villardón
  • + 1 author+ 0 author

2 November 2016

Tomatoes have been described as a functional food because of their particular composition of different bioactive compounds. In this study, the proximate composition, minerals and trace elements, and antioxidant compounds were determined in two tomato...

(This article belongs to the Special Issue Bioactive Phytochemicals and Functional Food Ingredients in Fruits and Vegetables 2016)
  • Article
  • Open Access
2 Citations
4,611 Views
17 Pages

Subjective and Objective Insecurity in Spanish Cities

  • Ana María Huesca González,
  • Rolando-Oscar Grimaldo-Santamaría and
  • María del Pilar Quicios García

1 December 2021

This article related crime rates to social risk factors and to the feeling of insecurity in Spain. The first finding of this study, financed by National I + D Plan CSO2016-77549-P, AEI-FEDER, was the direct relation between crime rates and some socio...

(This article belongs to the Special Issue Wellbeing in Education, Career, and Work: Current Contributions from Emotional Intelligence and other Non-Cognitive Constructs to the Psychology of Sustainability)
  • Article
  • Open Access
23 Citations
6,405 Views
15 Pages

Sustainability Multivariate Analysis of the Energy Consumption of Ecuador Using MuSIASEM and BIPLOT Approach

  • Nathalia Tejedor-Flores,
  • Purificación Vicente-Galindo and
  • Purificación Galindo-Villardón

Rapid economic growth, expanding populations and increasing prosperity are driving up demand for energy, water and food, especially in developing countries. To understand the energy consumption of a country, we used the Multi-Scale Integrated Analysi...

(This article belongs to the Special Issue 6th World Sustainability Forum - Selected Papers)
  • Article
  • Open Access
21 Citations
10,775 Views
20 Pages

Gender Inequality in Latin America: A Multidimensional Analysis Based on ECLAC Indicators

  • Edith Medina-Hernández,
  • María José Fernández-Gómez and
  • Inmaculada Barrera-Mellado

27 November 2021

This article analyzes the behavior of gender indicators on the economic, physical, and decision-making autonomy of Latin-American women, based on data compiled and published in 2020 by the Gender Equality Observatory of the United Nations Economic Co...

(This article belongs to the Special Issue The Gender Dimension in Sustainability Policies and Their Evaluation)
  • Article
  • Open Access
35 Citations
5,214 Views
16 Pages

Exploring Relationships between Environmental Performance, E-Government and Corruption: A Multivariate Perspective

  • Carmen C. Rodríguez-Martínez,
  • Isabel María García-Sánchez,
  • Purificación Vicente-Galindo and
  • Purificación Galindo-Villardón

18 November 2019

In order to improve environmental performance, the participation of effective and transparent citizens and governments that help counteract corruption in environmental matters is crucial. In this sense, this work focuses on exploring relationships be...

(This article belongs to the Special Issue Environmental Policy and Governance, Rural Development Strategy and Sustainability)
  • Article
  • Open Access
20 Citations
5,907 Views
15 Pages

Sparse HJ Biplot: A New Methodology via Elastic Net

  • Mitzi Cubilla-Montilla,
  • Ana Belén Nieto-Librero,
  • M. Purificación Galindo-Villardón and
  • Carlos A. Torres-Cubilla

5 June 2021

The HJ biplot is a multivariate analysis technique that allows us to represent both individuals and variables in a space of reduced dimensions. To adapt this approach to massive datasets, it is necessary to implement new techniques that are capable o...

  • Article
  • Open Access
13 Citations
5,527 Views
13 Pages

Neuroendocrine Tumors: An Analysis of Prevalence, Incidence, and Survival in a Hospital-Based Study in Ecuador

  • Karime Montes Escobar,
  • Jose Luis Vicente-Villardon,
  • Rosa Elisa Villacís Gonzalez,
  • Paul Humberto Castillo Cordova and ,
  • Johanna Mabel Sánchez Rodríguez,
  • Melina De la Cruz-Velez and
  • Aline Siteneski
  • + 2 authors+ 0 author

18 August 2022

Neuroendocrine tumors (NETs) represent a heterogeneous malignancy group of neoplasms, with a limited amount of data from Latin America. Thus, this observational study aimed to provide data about the prevalence, incidence, and survival rates for NET i...

(This article belongs to the Special Issue 2nd Edition of Cancer in Human Health and Healthcare)
  • Article
  • Open Access
1,429 Views
27 Pages

Land-Use Evolution and Trends in Portugal: An Approach Based on the Standard Output

  • António Xavier,
  • Maria do Socorro Rosário,
  • Rui Fragoso,
  • Maria Leonor da Silva Carvalho and
  • Maria de Belém Costa Freitas

13 January 2026

Since Portugal acceded to the European Union, the measures introduced under the Common Agricultural Policy (CAP) have significantly influenced farmers’ behavior and their choices of agricultural activities, with different consequences on agricu...

(This article belongs to the Special Issue Agricultural Economics, Policies, and Rural Development for Sustainability)
  • Review
  • Open Access
1 Citations
698 Views
26 Pages

Basal Cell Carcinoma Research Landscape Overview via Latent Dirichlet Allocation and HJ-Biplot Analysis

  • Karime Montes-Escobar,
  • Javier de La Hoz-Maestre,
  • Humberto Llinás-Solano,
  • Carlos Alfredo Salas-Macias and ,
  • Esteban Fernández-Moreira,
  • Martha Fors and
  • Santiago J. Ballaz
  • + 2 authors+ 0 author

17 July 2026

Background: Basal cell carcinoma (BCC) of the skin is the most common cancer in humans, and its incidence rises annually. Despite its low death rate, BCC causes significant morbidity because of its destructive nature to local tissues. The aim of this...

(This article belongs to the Section Tumor Microenvironment)
  • Article
  • Open Access
6 Citations
2,782 Views
16 Pages

Analysing the Recent Dynamics of Agricultural Sustainability in Portugal Using a Compromise Programming Approach

  • António Xavier,
  • Maria de Belém Costa Freitas,
  • Rui Fragoso and
  • Maria do Socorro Rosário

30 September 2022

Society recognises the importance of agriculture to supply goods, which are essential for human survival and well-being. Sustainable agriculture is an important goal since resources need to be preserved for future generations. The recent agricultural...

(This article belongs to the Section Sustainable Agriculture)
  • Article
  • Open Access
18 Citations
8,787 Views
18 Pages

Port State Control (PSC) inspections conducted under the Paris Memorandum of Understanding (MoU) agreement have become a crucial tool for maritime administrations in European Union countries to ensure compliance with international maritime safety sta...

(This article belongs to the Special Issue Recent Experiences and Monitoring in Coastal, Fluvial and Marine Hydrography)
  • Article
  • Open Access
3 Citations
3,514 Views
18 Pages

Modeling of the Physicochemical and Nutritional Composition of Musa paradisiaca (Williams Variety) at Different Ripening Stages in Ecuador

  • María Fernanda Garcés-Moncayo,
  • Fabricio Guevara-Viejó,
  • Juan Diego Valenzuela-Cobos,
  • Purificación Galindo-Villardón and
  • Purificación Vicente-Galindo

The banana (Musa paradisiaca AAA) is a tropical fruit native to Southeast Asia, widely cultivated in over 130 tropical and subtropical countries. It plays a vital role in both rural and urban diets and serves as a key economic resource in produc...

(This article belongs to the Special Issue Analysis of Agricultural Food Physicochemical and Sensory Properties)
  • Article
  • Open Access
6 Citations
2,211 Views
19 Pages

Data Mining to Evaluate the Effect of Eichhornia crassipes and Lemna minor in the Phytoremediation of Wastewater in the Canton of Milagro

  • Denny William Moreno Castro,
  • Omar Orlando Franco Arias,
  • Juan Diego Valenzuela Cobos,
  • Daniel Prieto Sánchez and
  • Cícero Pimenteira

21 May 2025

The constant increase in industrialization and urbanization has led to the regular discharge of wastewater into the environment in excessive amounts, which has caused significant impacts on both human and wildlife ecosystems. The sustainable manageme...

(This article belongs to the Section Water Quality and Contamination)
  • Article
  • Open Access
16 Citations
3,431 Views
22 Pages

New Approach to Determine the Activity Concentration Index in Cements, Fly Ashes, and Slags on the Basis of Their Chemical Composition

  • Andrés Caño,
  • José Antonio Suárez-Navarro,
  • Francisca Puertas,
  • Ana Fernández-Jiménez and
  • María del Mar Alonso

28 March 2023

The manufacture of Portland cement entails high energy and environmental costs, and various solutions have been implemented in recent years to mitigate this negative impact. These solutions include improvements in the manufacture of cement clinker or...

(This article belongs to the Special Issue Advances in Cement-Based Materials: Mechanical Behavior, Rheology, and Radiology)
  • Article
  • Open Access
4 Citations
3,661 Views
18 Pages

Water Quality Determination Using Soil and Vegetation Communities in the Wetlands of the Andes of Ecuador

  • Juan Carlos Carrasco Baquero,
  • Verónica Lucía Caballero Serrano,
  • Fernando Romero Cañizares,
  • Daisy Carolina Carrasco López and ,
  • David Alejandro León Gualán,
  • Rufino Vieira Lanero and
  • Fernando Cobo-Gradín
  • + 2 authors+ 0 author

11 August 2023

The bofedales are high Andean ecosystems of great socioeconomic and ecological importance. The Chimborazo Fauna Production Reserve has 15 bofedales in its jurisdiction, located in the provinces of Chimborazo, Bolívar, and Tungurahua. The objec...

  • Article
  • Open Access
3 Citations
3,927 Views
16 Pages

27 March 2025

In the hydrometeorological context of watersheds, water quality is strongly related to its physical, chemical, and biological characteristics. In this regard, the joint analysis of these parameters at the watershed level is highly important. The obje...

(This article belongs to the Section Hydrology)
  • Article
  • Open Access
1 Citations
2,866 Views
17 Pages

Evaluation of Adaptive Responses of Juglans neotropica Diels Progenies Based on Dasometric Traits

  • Raúl Armando Ramos-Veintimilla,
  • Fernando Romero-Cañizares,
  • Mariela González-Narváez,
  • Roy Vera-Velez and
  • Mario García-Mora

(1) Background: Juglans neotropica Diels, native to the Andes, is highly valued for its quality wood, medicinal uses, edible fruits, and natural dyes. However, its population has been greatly reduced due to overexploitation, becoming threatened and r...

(This article belongs to the Section Plant Biochemistry and Genetics)
  • Article
  • Open Access
891 Views
27 Pages

Game Theory provides a foundation for multi-agent systems, reinforcement learning, mechanism design, and adversarial learning within AI and ML. Nevertheless, few comprehensive studies map the structure and branches of this cross-disciplinary field. T...

(This article belongs to the Special Issue Computational Mathematics and Applied Statistics, 2nd Edition)
  • Article
  • Open Access
869 Views
15 Pages

Cardiometabolic Profile Segmentation in Ecuadorian University Students: A Multivariate Analysis of Lipid, Anthropometric, and Demographic Patterns

  • Kevin Gabriel Armijo Valverde,
  • Edgar Rolando Morales Caluña,
  • María Victoria Padilla Samaniego and
  • Katherine Denisse Suarez González

Cardiovascular and metabolic diseases (CMDs) are the leading causes of global mortality. While university students represent a critical demographic for early intervention, conventional univariate screenings often fail to capture the synergistic inter...

(This article belongs to the Topic Risk Management in Public Sector)
  • Article
  • Open Access
79 Citations
13,313 Views
26 Pages

Environmental Performance in Countries Worldwide: Determinant Factors and Multivariate Analysis

  • Isabel Gallego-Alvarez,
  • Mª Purificación Vicente-Galindo,
  • Mª Purificación Galindo-Villardón and
  • Miguel Rodríguez-Rosa

6 November 2014

The aim of this study is to analyze the environmental performance of countries and the variables that can influence it. At the same time, we performed a multivariate analysis using the HJ-biplot, an exploratory method that looks for hidden patterns i...

  • Article
  • Open Access
1,586 Views
19 Pages

Soil Transition and Characteristics Along a Periglacial–Agricultural Gradient in the Carihuairazo Volcano Area

  • Eduardo Antonio Muñoz-Jácome,
  • Pedro Vicente Vaca-Cárdenas,
  • Carlos Cajas-Bermeo,
  • Purificación Galindo Villardón and ,
  • Leticia Vaca-Cardenas,
  • Roberth Alcivar-Cevallos,
  • Marcela Yolanda Brito-Mancero,
  • Guicela Margoth Ati-Cutiupala,
  • Karen Lizbeth Yumi-Criollo and
  • Francesco Chiaravalloti
  • + 7 authors+ 2 authors

3 August 2026

Climate change and glacial retreat in the tropical Andes—as evidenced by environmental changes in the Carihuairazo volcano area and human-induced alterations to the páramo—reveal complex environmental dynamics that require an integ...

  • Article
  • Open Access
2 Citations
1,851 Views
25 Pages

Quality of life, as an essential component of sustainable development, is particularly relevant in transnational contexts characterized by deep inequalities in human development, equity, and social well-being. The objective of this paper is to analyz...

  • Article
  • Open Access
5 Citations
3,393 Views
12 Pages

Influence of Altitude and Climatic Factors on the Floristic Composition of the Moorlands of the Guamote Canton, Ecuador: Key Revelations for Conservation

  • Diego Francisco Cushquicullma-Colcha,
  • Guicela Margoth Ati-Cutiupala,
  • Edmundo Danilo Guilcapi-Pacheco,
  • Juan Federico Villacis-Uvidia and ,
  • Marcela Yolanda Brito-Mancero,
  • Pedro Vicente Vaca-Cárdenas,
  • Martha Marisol Vasco-Lucio,
  • Eduardo Antonio Muñoz-Jácome and
  • Maritza Lucia Vaca-Cárdenas
  • + 4 authors+ 0 author

7 January 2025

The Andean paramos are unique and biodiverse environments. Located between the upper limit of forest and perpetual snow, they provide ecosystem services, especially freshwater supply; however, anthropogenic activities and climate change have altered...

(This article belongs to the Special Issue Environmental Protection, Biodiversity Conservation and Sustainable Development)
  • Article
  • Open Access
10 Citations
6,772 Views
15 Pages

Mental Health in Women Victims of Gender Violence: Descriptive and Multivariate Analysis of Neuropsychological Functions and Depressive Symptomatology

  • Ana Victoria Torres García,
  • María Concepción Vega-Hernández,
  • Concha Antón Rubio and
  • Miguel Pérez-Fernández

Female victims of abuse, as well as suffering from psychopathological disorders such as depression, can have neuropsychological sequelae affecting memory and attention, with serious consequences, both physical and psychological, in their daily lives....

(This article belongs to the Collection Emotional Regulation and Mental Health)
  • Article
  • Open Access

Dynamics of Arsenic and Trace Metal Uptake and Translocation in Dominant Plants of High-Andean Wetlands: A Study in the Guaranda Canton, Within the Chimborazo Reserve, Ecuador

  • Guicela Margoth Ati-Cutiupala,
  • Paola Fernanda Arguello-Hernández,
  • Maritza Lucía Vaca-Cárdenas,
  • Wilian Marcelo Bravo-Morocho and ,
  • Erika Lissette Tenelema-Luisa,
  • Marcela Yolanda Brito-Mancero,
  • Eduardo Antonio Muñoz-Jácome,
  • Esthela Isabel Colcha-Guashpa,
  • Cristian David Panchana-Guerra and
  • Purificación Galindo-Villardon
  • + 6 authors+ 1 author

High-Andean wetlands regulate water supply, but their volcanic soils may release arsenic and trace metals. We quantified As, Cd, Cr, Hg, and Pb in roots, stems, and leaves of the six dominant species of the seven wetlands of the Guaranda canton of th...

(This article belongs to the Section Plant Conservation)
  • Article
  • Open Access
11 Citations
3,673 Views
29 Pages

Scientific Collaboration and Sustainable Development: A Bibliometric Analysis of the Andean Region, Panama, and Spain

  • Gresky Gutiérrez-Sánchez,
  • Patricio Álvarez-Muñoz,
  • Purificación Galindo-Villardón and
  • Purificación Vicente-Galindo

Background: Scientific collaboration has become a cornerstone of sustainable development, particularly in regions where research capacity and funding face significant challenges. The Andean region, Panama, and Spain offer a unique perspective due to...

  • Article
  • Open Access
741 Views
18 Pages

Patterns of Specialization and Faunal Connectivity in the Biomes of the Chimborazo Reserve, Ecuador: A Multivariate Analysis of High-Andean Fauna

  • Guicela Margoth Ati-Cutiupala,
  • José Fernando Romero Cañizares,
  • Purificación Vicente-Galindo,
  • Eugénia Maria Dores Maia Ferreira and ,
  • Eduardo Antonio Muñoz-Jácome and
  • Purificación Galindo-Villardon
  • + 1 author+ 0 author

The Andes serve as natural laboratories where biomes shape faunal communities into mosaics of habitats prone to fragmentation, making protected areas such as the Chimborazo Reserve (RC) critical refuges in the face of climate change. Based on this pr...