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Ronny Obed Vallejos Arriagada

Associate professor and Head

Universidad Técnica Federico Santa María

Valparaíso, Chile

Geostatistics, Statistical image processing, Big Data, Data Science

Statistics, UNIVERSITY OF MARYLAND - BALTIMORE. Estados Unidos, 2006
Statistics, University of Connecticut, USA. Estados Unidos, 2002
Mathematics, UNIVERSIDAD TECNICA FEDERICO SANTA MARIA. Chile, 1998
Mathematics, UNIVERSIDAD DE CHILE. Chile, 1995

Associate professor Full Time

UNIVERSIDAD DE VALPARAISO

Science

Valparaiso, Chile

1998 - 2009
Assistant professor Full Time

UNIVERSIDAD TECNICA FEDERICO SANTA MARIA

Mathematics

Valparaíso, Chile

2010 - A la fecha

I have been the adviser of the following undergraduate and master students at the university of Valparaiso and at UTFSM, Chile

16. Diego Mancilla. Magister en Ciencias, Mención Matemática, UTFSM, expected graduation date: January, 2014.
15. Consuelo Moreno. Ingeniería Civil Matemática, UTFSM, expected graduation date: August, 2013.
14. Jonathan Acosta. Ingeniería Civil Matemática, UTFSM, June 13, 2013. Co-advised by Felipe Osorio.
13. Francisco Cuevas. Magister en Ciencias, Mención Matemática, UTFSM, April 19, 2013. Co-advised by Felipe Osorio.
12. Juan Carlos Herrera. Magister en Estadística, Universidad de Valparaíso, 2012.
11. Guillermo Pérez. Estadístico, Pontificia Universidad Católica de Valparaíso, 2011.
10. Francisco Cuevas. Ingeniería Civil Matemática, Universidad Técnica Federico Santa María, 2011.
9. Humberto Villalobos. Magister en Estadística, Pontificia Universidad Católica de Valparaíso, 2009.
8. Lorena Pérez. Magister en Estadística, Pontificia Universidad Católica de Valparaíso, 2009.
7. Rubén Miranda. Estadístico, Pontificia Universidad Católica de Valparaíso, 2009.
6. Vivian Contreras. Ingeniero Estadístico, Universidad de Valparaíso, 2009.
5. Paulina Ríos. Ingeniero Estadístico, Universidad de Valparaíso, 2009.
4. Juan Carlos Herrera. Ingeniero Estadístico, Universidad de Valparaíso, 2009.
3. Marcelo Torres. Estadístico, Pontificia Universidad Católica de Valparaíso, 2008.
2. Victor Jara. Estadístico, Pontificia Universidad Católica de Valparaíso, 2008.
1. Margarita Olivares. Licenciada en Estadística, Universidad de Valparaíso, 2000

Currently, I am the adviser of Jonathan Acosta on of the first students in our Ph.D. program in Mathematics atr UTFSM, Chile.

In the paper

Cuevas, F., Porcu, E., Vallejos, R. (2013). Study of spatial relationships between two sets of variables: A nonparametric approach.
Journal of Nonparametric Statistics 25, 695-714.

we developed a very novel tool to visualize the spatial association between two spatial processes or images. This tool is called codispersion map and the computational implementation has been done as a library in R. An introductory paper in this respect is under review

Vallejos, R., Osorio, F., Cuevas, F. (2013). SpatialPack-An R Package for computing spatial association between two processes (submitted).

CONICYT SCHOOLARSHIP

UNIVERSIDAD TECNICA FEDERICO SANTA MARIA

Chile, 1996

Schoolarship to pursuit Master of Science in Mathematics at UTFSM.
Beca Presidente de la República

University of Connecticut, USA

Chile, 2000

National Schoolarship to pursuit Graduate Studies at the University of Connecticut, USA
Student Paper Competition

American Statistical Institution

Estados Unidos, 2002

Winner of the student paper competition in the statistics computing section, 2002.
Best Teaching Assistant of the Year

University og MAryland Baltimore County

Chile, 2004

Best TA of the year, Department of Mathematics, UMBC, 2004.
Research Annual Conference UMBC-UMD

UMBC

Chile, 2005

Second place in the research annual conference, 2005.
Research Annual Conference UMBC-UMD

UMBC

Chile, 2006

First place in the Research Annual Conference. Baltimore 2006.


Assessing the effective sample size for large spatial datasets: A block likelihood approach. Acosta, J., Alegría, A., Osorio, F., Vallejos, R. Article WOS COMPUTATIONAL STATISTICS DATA ANALYSIS (2021)
Effective sample size for multivariate spatial processes with an application to soil contamination. Vallejos, R., Acosta, J. Article Natural Resource Modeling (2021)
Statistical estimation of the structural similarity index for image quality assessment. Osorio, F., Vallejos, R., Barraza, W., Ojeda, S., Landi, M Article WOS SIGNAL IMAGE AND VIDEO PROCESSING (2021)
A spatial concordance correlation coefficient with an application to image analysis Vallejos R.; PÃ©rez J.; Ellison A.M.; Richardson A.D. Article SCOPUS Spatial Statistics (2020)
Comovement among returns of the private Chilean pension system Vallejos, R; Garate, A.; Gomez, M Article WOS-ESCI SCOPUS INTERNATIONAL REVIEW OF APPLIED ECONOMICS (2019)
An image quality index based on coefficients of spatial association with an application to image fusion Ojeda, S.; Britos, G.; Vallejos, R. Article SPATIAL STATISTICS (2018)
Assessing the estimation of trawling catches using LiDAR sensor technology Vallejos, Ronny; Yandún, Francisco; San Martín, Marcelo A.; Escobar, Victoria; Román, Catalina; Cheein, Fernando Auat Article ISI SCOPUS Ocean and Coastal Management (2018)
Effective sample size for spatial regression models Acosta, Jonathan; Vallejos, Ronny Article ISI SCOPUS ELECTRONIC JOURNAL OF STATISTICS (2018)
On the effective geographic sample size Acosta, Jonathan; Vallejos, Ronny; Griffth, Daniel Article ISI SCOPUS JOURNAL OF STATISTICAL COMPUTATION AND SIMULATION (2018)
Sensitivity of Codispersion to Noise and Error in Ecological and Environmental Data Vallejos, Ronny; Buckley, Hannah; Case, Bradley; Acosta, Jonathan; Ellison, Aaron M. Article ISI SCOPUS FORESTS (2018)
Detecting ecological patterns along environmental gradients: alpine treeline ecotones. Buckley, H., Bradley, S., Vallejos, R., Camarero, J., Liang, E., Wang, Y., Elisson, A. Article Chance (2016)
Effective Sample Size for Line Transect Sampling Models with an Application to Marine Macroalgae Acosta, J.; Osorio, F; Vallejos, R Article ISI SCOPUS Journal of Agricultural, Biological, and Environmental Statistics (2016)
Image Similarity Assessment Based on Coefficients of Spatial Association Vallejos, R; Mancilla, D; Acosta, J. Article ISI SCOPUS JOURNAL OF MATHEMATICAL IMAGING AND VISION (2016)
A conversation with Oscar Bustos Vallejos, R., Ojeda, S. Article Chilean Journal of Statistics (2015)
A multivariate geostatistical approach for landscape classification from remotely sensed image data Vallejos, R., Mallea, A., Herrera, M., Ojeda. Article Stochastic Environmental Research and Risk Assessment (2015)
Assessing the significance of the correlation between the components of a bivariate Gaussian random field Bevilacqua, M; Vallejos, R; Velandia, D Article ISI SCOPUS Environmetrics (2015)
The codispersion map: a graphical tool to visualize the association between two spatial processes Vallejos, R., Osorio, F., Mancilla, D. Article Statistica Neerlandica (2015)
The codispersion map: a graphical tool to visualize the association between two spatial variables Vallejos, Ronny; Osorio, Felipe; Mancilla, Diego Article ISI SCOPUS Statistica Neerlandica (2015)
Effective sample size for spatial process models Vallejos, R., Osorio, F. Article Spatial Statistics (2014)
A multivariate geostatistical approach for landscape classification from remotely sensed image data Vallejos, R; Mallea A.; Herrera M.Á.; Ojeda, S Article ISI SCOPUS Stochastic Environmental Research and Risk Assessment (2014)
Effective sample size of spatial process models Vallejos, Ronny; Osorio, Felipe Article SCOPUS Spatial Statistics (2014)
Dehydrogenase enzymes associated to glycolysis 1 in beef carcasses stored at 0ºC Acevedo, C., Cornejo, M., Olguín, Y., Vallejos, R., Brown, D. Article Food and Bioprocess Technology (2013)
Study of spatial relationships between two sets of variables: a nonparametric approach Cuevas F.; Porcu, E; Vallejos, R Article ISI SCOPUS Journal of Nonparametric Statistics (2013)
The application of a general time series model to floodplain fisheries in the Amazon Vallejos, RO; Fabre, NN; Batista, VD; Acosta, J. Article ISI SCOPUS Environmental Modelling and Software (2013)
The application of a general time series model to floodplain fisheries in the Amazon Vallejos, R., Batista, V.S., Fabré, N.N., Acosta, J. Article Environmental Modelling and Software (2013)
Measure of similarity between images based on the codispersion coefficient Ojeda, Silvia; Vallejos, Ronny; Lamberti, Pedro Article ISI SCOPUS Journal of Electronic Imaging (2012)
Testing for the absence of correlation between two spatial or temporal sequences Vallejos R.O. Article PATTERN RECOGNITION LETTERS (2012)
Testing for the absence of correlation between two spatial or temporal sequences Vallejos R.O. Article ISI SCOPUS Pattern Recognition Letters (2012)
A new image segmentation algorithm with applications to image inpainting Ojeda, S; Vallejos, R; Bustos O. Article ISI SCOPUS Computational Statistics and Data Analysis (2010)
Asymptotic behavior of RA-estimates in autoregressive 2D processes Bustos, OH; Ruiz, M.; Ojeda, S; Vallejos, R; Frery, AC Article ISI SCOPUS JOURNAL OF STATISTICAL PLANNING AND INFERENCE (2009)
Spatial ARMA models and its applications to image filtering Bustos O.; Ojeda, S; Vallejos, R Article ISI BRAZILIAN JOURNAL OF PROBABILITY AND STATISTICS (2009)
Assessing the association between two spatial or temporal sequences Vallejos, R Article ISI SCOPUS JOURNAL OF APPLIED STATISTICS (2008)
Codispersion coefficients for spatial and temporal series Rukhin, AL; Vallejos, R Article ISI SCOPUS STATISTICS PROBABILITY LETTERS (2008)
Bayesian analysis of contaminated quarter plane moving average models Vallejos, RO; Garcia-Donato, G Article ISI SCOPUS JOURNAL OF STATISTICAL COMPUTATION AND SIMULATION (2006)
A recursive algorithm to restore images based on robust estimation of NSHP autoregressive models Vallejos, RO; Mardesic, TJ Article ISI SCOPUS Journal of Computational and Graphical Statistics (2004)
Performance of robust RA estimator for bidimensional autoregressive models Ojeda, SM; Vallejos, RO; Lucini, MM Article ISI JOURNAL OF STATISTICAL COMPUTATION AND SIMULATION (2002)
Estimacion robusta en modelos para imagénes Ojeda, Silvia; Vallejos, Ronny; Lucini, Magdalena Article INFORMACION TECNOLOGICA (2001)
Robust image modeling on image processing Allende, H.; Galbiati J.; Vallejos, R Article ISI SCOPUS Pattern Recognition Letters (2001)
Digital image restoration using autoregressive time series models Allende, H., Galbiati, J., Vallejos, R. Article Non Bolletin European Spatial Agency (1998)
Discussion of the paper "How to find an appropriate clustering for mixed type variables with application to socio-economic variables Vallejos, Ronny; Porcu, Emilio; Bevilacqua, Moreno Article Journal of The Royal Statistical Society C


Spatil Relationships Between Two Georeferenced Variables: With Applications in R Vallejos, R., Osorio, F., Bevilacqua BookWhole (2017)


Fulbright Specialist Program Vallejos, Ronny; Ellison, Aaron Proyecto Proyecto trasladado al año 2021 debido al COVID-19 (2020)
Effective Sample Size for Spatial Processes with Nearly Singular Covariance Matrices. Proyecto Interno USM (PI_L_18_20) Proyecto 2018-2019 Inv. Principal
Estimación de Volúmemes de Copos de Capturas en Pesca de Arrastre Mediante El Uso de Sensores. UTFSM (216.12.1) Proyecto 2016-2016 Director(a)
Medidas de Similaridad e ?Indices de calidad para im?agenes digitales. Teor?í?a y Aplicaciones.". Secyt-UNC, Argentina (307 201501 00720 CB) Proyecto 2016-2017 Coinvestigador(a)
Estimación de modelos parcialmente lineales en la covarianza con aplicaciones al cálculo de tamaño muestral efectivo en datos georeferenciados Universidad Técnica Federico Santa María (15.15.09) Proyecto 2015-2015 Inv. Responsable
Centro Avanzado de Ingeniería Eléctrica y Electrónica FONDAP (FB-0008) Proyecto 2014-2022 Coinvestigador(a)
Estimaci?on Robusta en Modelos ARMA Bidimensionales. Aplicaciones en Procesamiento Estad??stico de Im?agenes Digitales Secyt-UNC, Argentina (05/B558) Proyecto 2014-2015 Coinvestigador(a)
ASSOCIATION CHARACTERISTICS BETWEEN TWO SPATIAL PROCESSES AND REDUCTION OF SAMPLE SIZES IN SPATIAL STATISTICS FONDECYT (1120048) Proyecto 2012-2016 Inv. Responsable
Comparaci?on de Procesos Espacio-Temporales. Medidas de Similaridad, Asociaci?on e Indices de Calidad en Im?agenes Digitales Secyt-UNC, Argentina (05/B517) Proyecto 2012-2013 Coinvestigador(a)
Criterios de Información y Diagnóstico en Modelos de Regresión Espacial Universidad Técnica Federico Santa María (12.12.05) Proyecto 2012-2013 Inv. Responsable
Fortalecimiento del Área Estadística en el Departamento de Matemática de la USM FONDECYT (791100007) Proyecto 2012-2014 Inv. Responsable
Estimación no Paramétrica del Coeficiente de Codispersión=> Aspectos Teóricos y Prácticos Proyecto Basal (FB/01RV/11) Proyecto 2011-2011 Inv. Responsable
Reducción de Tamaños Muestrales en Estadística Espacial Universidad Técnica Federico Santa María (12.10.03) Proyecto 2010-2011 Inv. Responsable
A SIMILARITY COEFFICIENT FOR SPATIAL AND TEMPORAL PROCESSES FONDECYT (11075095) Proyecto 2007-2010 Inv. Responsable