Consulta: subjectFacets:"PLS regression"
Registros recuperados: 3
Data/hora: 11/06/2024 11:58:57

Regresión de Mínimos Cuadrados Parciales para Datos Variedad-Valuados.
Provedor de dados: 32
Autores: Pérez Agámez, Raúl Alberto.
En esta tesis se desarrolla la metodología de regresión de mínimos cuadrados parciales (PLS) para datos variedad-valuados. Primero se realiza una revisión sobre algunos métodos modernos de regresión no-lineal, luego se continúa con una exploración de la metodología de regresión para datos variedad-valuados y finalmente se desarrolla una nueva metodología de regresión para datos variedad-valuados, para la cual se demuestra que en ciertas situaciones especiales, produce mejores resultados que las técnicas tradicionales de regresión que son aplicables a este tipo de datos. Aunque la metodología desarrollada es aplicable a variedades generales, esta se ilustra en aplicaciones de conjuntos de datos de ciertas estructuras orgánicas que son representadas...
Palavras-chave: Variedad Riemanniana; Datos variedad-valuados; Regresión sobre variedades; Imágen de resonancia magnética; Imágen por tensor difusión; Regresión PLS; Doctorado; Estadística; Riemannian manifold; Manifold-valued data; Regression on manifolds; Magnetic resonance imaging (MRI); Diffusion tensor imaging (DTI); PLS regression.
Ano: 2012
URL: http://hdl.handle.net/10521/1764

White mold detection in common beans through leaf reflectance spectroscopy
Provedor de dados: 70
Autores: Machado,Marley L.; Pinto,Francisco de A. C.; Paula Junior,Trazilbo J. de; Queiroz,Daniel M. de; Cerqueira,Ozires de A. T.
ABSTRACT This study aimed to identify wavelengths based on leaf reflectance (400-1050 nm) to estimate white mold severity in common beans at different seasons. Two experiments were carried out, one during fall and another in winter. Partial Least Squares (PLS) regression was used to establish a set of wavelengths that better estimates the disease severity at a specific date. Therefore, observations were previously divided in two sub-groups. The first one (calibration) was used for model building and the second subgroup for model testing. Error measurements and correlation between measured and predicted values of disease severity index were employed to provide the best wavelengths in both seasons. The average indexes of each experiment were of 5.8% and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sclerotinia sclerotiorum; PLS regression; Pigments; Spectrum; Absorption.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000601117

A step toward the definition of ecological indicators of the impact of fishing on the fish assemblage of the Abore reef reserve (New Caledonia)
Provedor de dados: 5
Autores: Amand, Marion; Pelletier, Dominique; Ferrari, Jocelyne; Kulbicki, Michel.
Marine Protected Areas (MPA) are often contemplated as a tool for the sustainable management of exploited resources and ecosystem conservation. This paper proposes an approach to establish a statistical diagnostic of the effects of MPAs on fish assemblages, and define corresponding ecological indicators. This requires choosing relevant variables (abundance, diversity, demographic parameters..) and appropriate statistical methods. The study was based on data from the Abore reef Reserve in New Caledonia. Two sets of methods: 1-inferential linear models (ANOVA, GLM): 2- Partial Least Squares (PLS) methods of regression, were used to test the effects of this MPA. PLS enabled us to test simultaneously within a model, density, species richness, biomass and mean...
Tipo: Text
Palavras-chave: New Caledonia; PLS regression; Ecological indicators; Fishing impact; Coral reef; Fish; Marine Protected Areas.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-398.pdf