Listar MAT_Articles por autoría "b07c9a6c-fb25-45bd-8670-2ec31b70f2bb"
Mostrando ítems 1-20 de 42
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A Data Science Analysis of Academic Staff Workload Profiles in Spanish Universities: Gender Gap Laid Bare
Cabero-Fayos, Ismael; Epifanio, Irene MDPI (2021-06-25)This paper presents a snapshot of the distribution of time that Spanish academic staff spend on different tasks. We carry out a statistical exploratory study by analyzing the responses provided in a survey of 703 Spanish ... -
A data-driven classification of 3D foot types by archetypal shapes based on landmarks
Alcacer Sales, Aleix; Epifanio, Irene; Ibáñez Gual, Maria Victoria; Simó, Amelia; Ballester, Alfredo Costin Daniel Untaroiu (Virginia Tech, USA) (2020-01-30)The taxonomy of foot shapes or other parts of the body is important, especially for design purposes. We propose a methodology based on archetypoid analysis (ADA) that overcomes the weaknesses of previous methodologies used ... -
A neuroimaging data set on problem solving in the case of the reversal error: Putamen data
Ferrando, Lara; Ventura Campos, Mercedes; Epifanio, Irene Elsevier (2020-09-19)Structural Magnetic Resonance Images (sMRI) for a sample of university students were recorded. Out of magnetic resonance, students performed a test of algebra problem solving. As we are interested in reversal errors, the ... -
A New Geometric Metric in the Shape and Size Space of Curves in R n
Epifanio, Irene; Gimeno, Vicent; Gual-Arnau, Ximo; Ibáñez Gual, Maria Victoria MDPI (2020-10-01)Shape analysis of curves in Rn is an active research topic in computer vision. While shape itself is important in many applications, there is also a need to study shape in conjunction with other features, such as scale and ... -
¿A qué dedica el tiempo el profesorado universitario?
Gual-Arnau, Ximo; Epifanio, Irene; Cabero-Fayos, Ismael ASOCIACION THE CONVERSATION ESPAÑA (2023-03)Las tareas y horas de trabajo semanal del profesorado universitario constituyen un tema de constante actualidad. Aunque es en las universidades donde se desarrolla la mayoría de la investigación y transferencia en España, ... -
An ensemble of ordered logistic regression and random forest for child garment size matching
Pierola, A.; Epifanio, Irene; Alemany Mut, Sandra Elsevier (2016-11)Size fitting is a significant problem for online garment shops. The return rates due to size misfit are very high. We propose an ensemble (with an original and novel definition of the weights) of ordered logistic regression ... -
Analysis of a social webquest fors statistics in engineering
Epifanio, Irene Common Ground Publishing (2010)A webquest for students of an introductory course in Statistics in Industrial Design Engineering is presented and analyzed. In order to make students work on the most basic concepts (sampling and description of data) and ... -
Analysis of Archetypes to Determine Time Use and Workload Profiles of Spanish University Professors
Cabero-Fayos, Ismael; Epifanio, Irene; Gual-Arnau, Ximo MDPI (2023)Allocation of time use is important to develop appropriate policies, especially in terms of gender equality. Individual well-being depends on many factors, including how time is spent. Therefore, knowing and analysing ... -
Analysis of multiple waveforms by means of functional principal component analysis: normal versus pathological patterns in sit-to-stand movement
Epifanio, Irene; Ávila, Carolina; Page del Pozo, Álvaro; Atienza, Carlos Springer Verlag (2008)This paper presents an application of Functional Principal Component Analysis (FPCA) to describe inter-subject variability of multiple waveforms. This technique was applied to the study of sit-to-stand movement in two ... -
Apparel sizing using trimmed PAM and OWA operators
Ibáñez Gual, Maria Victoria; Epifanio, Irene; Simó, Amelia; Vinué Visús, Guillermo; Alemany Mut, Sandra; Domingo Esteve, Juan de Mata; Ayala Gallego, Guillermo Elsevier (2012-09)This paper is concerned with apparel sizing system design. One of the most important issues in the apparel development process is to define a sizing system that provides a good fit to the majority of the population. A ... -
Archetypal analysis for ordinal data
Fernández, Daniel; Epifanio, Irene; McMillan, Louise Elsevier Inc. (2021-08-03)Archetypoid analysis (ADA) is an exploratory approach that explains a set of continuous observations as mixtures of pure (extreme) patterns. Those patterns (archetypoids) are actual observations of the sample which makes ... -
Archetypal analysis with missing data: see all samples by looking at a few based on extreme profiles
Epifanio, Irene; Ibáñez Gual, Maria Victoria; Simó, Amelia American Statistical Association (2019-05-13)In this paper we propose several methodologies for handling missing or incomplete data in Archetype analysis (AA) and Archetypoid analysis (ADA). AA seeks to find archetypes, which are convex combinations of data points, ... -
Archetypal analysis: an alternative to clustering for unsupervised texture segmentation
Cabero-Fayos, Ismael; Epifanio, Irene International Society for Stereology & Image Analysis (2019-04)Texture segmentation is one of the main tasks in image applications, specifically in remote sensing, where the objective is to segment high-resolution images of natural landscapes into different cover types. Often the focus ... -
Archetypal analysis: contributions for estimating boundary cases in multivariate accommodation problem
Epifanio, Irene; Vinué Visús, Guillermo; Alemany Mut, Sandra Elsevier (2012-12)The use of archetypal analysis is proposed in order to determine a set of representative cases that entail a certain percentage of the population, in the accommodation problem. A well-known anthropometric database has been ... -
Archetypal Curves in the Shape and Size Space: Discovering the Salient Features of Curved Big Data by Representative Extremes
Epifanio, Irene; Gimeno, Vicent; Gual-Arnau, Ximo; Ibáñez Gual, Maria Victoria Springer (2023)Curves are complex data. Tools for visualizing, exploring, and discovering the structure of a data set of curves are valuable. In this paper, we propose a scalable methodology to solve this challenge. On the one hand, ... -
Archetypal shapes based on landmarks and extension to handle missing data
Epifanio, Irene; Ibáñez Gual, Maria Victoria; Simó, Amelia Springer Verlag (2017-10)Archetype and archetypoid analysis are extended to shapes. The objective is to find representative shapes. Archetypal shapes are pure (extreme) shapes. We focus on the case where the shape of an object is represented by a ... -
Archetype analysis: A new subspace outlier detection approach
Cabero-Fayos, Ismael; Epifanio, Irene; Piérola Orcero, Ana; Ballester, Alfredo Elsevier (2021)The problem of detecting outliers in multivariate data sets with continuous numerical features is addressed by a new method. This method combines projections into relevant subspaces by archetype analysis with a nearest ... -
Archetypoid analysis for sports analytics
Vinué Visús, Guillermo; Epifanio, Irene Springer Verlag (2017-06)We intend to understand the growing amount of sports performance data by finding extreme data points, which makes human interpretation easier. In archetypoid analysis each datum is expressed as a mixture of actual observations ... -
Archetypoids: A new approach to define representative archetypal data
Vinué Visús, Guillermo; Epifanio, Irene; Alemany Mut, Sandra Elsevier (2015)The new concept archetypoids is introduced. Archetypoid analysis represents each observation in a dataset as a mixture of actual observations in the dataset, which are pure type or archetypoids. Unlike archetype analysis, ... -
Child t-shirt size data set from 3D body scanner anthropometric measurements and a questionnaire
Pierola, A.; Epifanio, Irene; Alemany Mut, Sandra Elsevier (2017-04)A dataset of a fit assessment study in children is presented. Anthropometric measurements of 113 children were obtained using a 3D body scanner. Children tested a t-shirt of different sizes and a different model for boys ...