Zobrazeno 1 - 10
of 108
pro vyhledávání: '"RAYDONAL OSPINA"'
Publikováno v:
Stats, Vol 7, Iss 3, Pp 967-983 (2024)
This study evaluates the symmetry of data distributions after normalization, focusing on various statistical tests, including a few explored test named Rp. We apply normalization techniques, such as variance stabilizing transformations, to ribonuclei
Externí odkaz:
https://doaj.org/article/88f5e3418acf44cdaaf22b7af2fc02cb
Autor:
Raydonal Ospina, Patrícia L. Espinheira, Leilo A. Arias, Cleber M. Xavier, Víctor Leiva, Cecilia Castro
Publikováno v:
Mathematics, Vol 12, Iss 20, p 3196 (2024)
Residuals are essential in regression analysis for evaluating model adequacy, validating assumptions, and detecting outliers or influential data. While traditional residuals perform well in linear regression, they face limitations in exponential fami
Externí odkaz:
https://doaj.org/article/88ec79bf596a4f7e8569aa306092e6cc
Publikováno v:
Anais da Academia Brasileira de Ciências, Vol 96, Iss 1 (2024)
Abstract In this work, we focus on obtaining insights of the performances of some well-known machine learning image classification techniques (k-NN, Support Vector Machine, randomized decision tree and one based on stochastic distances) for PolSAR (P
Externí odkaz:
https://doaj.org/article/b824ce1994d845119fdc5d1a6bae3807
Publikováno v:
Stats, Vol 6, Iss 4, Pp 990-1007 (2023)
In January 2020, the world was taken by surprise as a novel disease, COVID-19, emerged, attributed to the new SARS-CoV-2 virus. Initial cases were reported in China, and the virus rapidly disseminated globally, leading the World Health Organization (
Externí odkaz:
https://doaj.org/article/24466b883d04436682ebcdd10af5d203
Publikováno v:
Analytics, Vol 2, Iss 2, Pp 410-425 (2023)
Learning methods in survival analysis have the ability to handle censored observations. The Cox model is a predictive prevalent statistical technique for survival analysis, but its use rests on the strong assumption of hazard proportionality, which c
Externí odkaz:
https://doaj.org/article/4c12010cabac48cdbd65bf3acdd427e9
Publikováno v:
Stats, Vol 5, Iss 2, Pp 422-439 (2022)
Crop area estimates based on counting pixels over classified satellite images are a promising application of remote sensing to agriculture. However, such area estimates are biased, and their variance is a function of the error rates of the classifica
Externí odkaz:
https://doaj.org/article/fa84bb216a8e4b1cad3d20edf9767081
Publikováno v:
Biomedicines, Vol 11, Iss 10, p 2604 (2023)
This research aims to enhance the classification and prediction of ischemic heart diseases using machine learning techniques, with a focus on resource efficiency and clinical applicability. Specifically, we introduce novel non-invasive indicators kno
Externí odkaz:
https://doaj.org/article/162ca0781de84e30a8f926d8eccfda81
Autor:
José Sérgio Casé de Oliveira, Raydonal Ospina, Víctor Leiva, Jorge Figueroa-Zúñiga, Cecilia Castro
Publikováno v:
Fractal and Fractional, Vol 7, Iss 9, p 667 (2023)
A fractile is a location on a probability density function with the associated surface being a proportion of such a density function. The present study introduces a novel methodological approach to modeling data within the continuous unit interval us
Externí odkaz:
https://doaj.org/article/1d21ba651ff343b1b32b8dfc47c41796
Publikováno v:
Mathematics, Vol 11, Iss 14, p 3069 (2023)
This comprehensive overview focuses on the issues presented by the pandemic due to COVID-19, understanding its spread and the wide-ranging effects of government-imposed restrictions. The overview examines the utility of autoregressive integrated movi
Externí odkaz:
https://doaj.org/article/432ae1648f39426c9521e157bde6ce69
Autor:
Geiza Silva, André Leite, Raydonal Ospina, Víctor Leiva, Jorge Figueroa-Zúñiga, Cecilia Castro
Publikováno v:
Mathematics, Vol 11, Iss 14, p 3072 (2023)
The maximum diversity problem (MDP) aims to select a subset with a predetermined number of elements from a given set, maximizing the diversity among them. This NP-hard problem requires efficient algorithms that can generate high-quality solutions wit
Externí odkaz:
https://doaj.org/article/d36fb83d0ad545449add9761850fa87c