Results 121 to 130 of about 7,539,132 (320)

Tuning Parameter Selection in Regularized Estimations of Large Covariance Matrices [PDF]

arXiv, 2013
Recently many regularized estimators of large covariance matrices have been proposed, and the tuning parameters in these estimators are usually selected via cross-validation. However, there is no guideline on the number of folds for conducting cross-validation and there is no comparison between cross-validation and the methods based on bootstrap ...
arxiv  

Validation of community pharmacy : confirming the effectiveness of a pharmacist in a community setting [PDF]

, 1988
Validation of community pharmacy is a concept we coined to define the process carried out to demonstrate that the services provided by a community pharmacist are needed by the community. One method to undertake such a process was developed.
Azzopardi, Lilian M., Salek, Sam, Serracino-Inglott, Anthony, Zarb Adami, Maurice   +3 more
core  

On Regularization Parameter Estimation under Covariate Shift

, 2016
This paper identifies a problem with the usual procedure for L2-regularization parameter estimation in a domain adaptation setting. In such a setting, there are differences between the distributions generating the training data (source domain) and the ...
Kouw, Wouter M., Loog, Marco
core   +1 more source

Integrative systems‐level analysis reveals a contextual crosstalk between hypoxia and global metabolism in human breast tumors

Molecular Oncology, EarlyView.
Breast tumor samples scored for metabolic deregulation (M1 to M3) were given a hypoxia score (HS). The highest HS occurred in patients with strongest metabolic deregulation (M3), supporting tumor aggressiveness. HS correlated with the highest number of metabolic pathways in M1. This suggests hypoxia to be an early event in metabolic deregulation.
Raefa Abou Khouzam, Salem Chouaib, Mohammad Askandar Iqbal   +2 more
wiley   +1 more source

Partitioned Cross-Validation for Divide-and-Conquer Density Estimation [PDF]

arXiv, 2016
We present an efficient method to estimate cross-validation bandwidth parameters for kernel density estimation in very large datasets where ordinary cross-validation is rendered highly inefficient, both statistically and computationally. Our approach relies on calculating multiple cross-validation bandwidths on partitions of the data, followed by ...
arxiv  

Is this sentence valid? An Arabic Dataset for Commonsense Validation [PDF]

arXiv, 2020
The commonsense understanding and validation remains a challenging task in the field of natural language understanding. Therefore, several research papers have been published that studied the capability of proposed systems to evaluate the models ability to validate commonsense in text.
arxiv  

Integrative analysis of circulating tumor cells (CTCs) and exosomes from small‐cell lung cancer (SCLC) patients: a comprehensive approach

Molecular Oncology, EarlyView.
This study simultaneously investigated circulating tumor cells (CTCs) and exosomes from small‐cell lung cancer (SCLC) patients. The elevated expression of JUNB and CXCR4 in CTCs was a poor prognostic factor for SCLC patients, whereas exosomal overexpression of these biomarkers revealed a high discrimination ability of patients from healthy individuals,
Dimitrios Papakonstantinou, Argyro Roumeliotou, Evangelia Pantazaka, Athanasios‐Nasir Shaukat, Athina Christopoulou, Angelos Koutras, Foteinos‐Ioannis Dimitrakopoulos, Vassilis Georgoulias, Anastasia Xagara, Evangelia Chantzara, Fillipos Koinis, Athanasios Kotsakis, Constantinos Stathopoulos, Galatea Kallergi   +13 more
wiley   +1 more source

Reconstruction of Fine-Spatial-Resolution FY-3D-Based Vegetation Indices to Achieve Farmland-Scale Winter Wheat Yield Estimation via Fusion with Sentinel-2 Data

Remote Sensing
The spatial resolution (250–1000 m) of the FY-3D MERSI is too coarse for agricultural monitoring at the farmland scale (20–30 m). To achieve the winter wheat yield (WWY) at the farmland scale, based on FY-3D, a method framework is developed in this work.
Xijia Zhou, Tao Wang, Wei Zheng, Mingwei Zhang, Yuanyuan Wang   +4 more
doaj   +1 more source

Towards Simplifying PKI Implementation: Client-Server based Validation of Public Key Certificates [PDF]

In Proceedings of the 2nd IEEE International Symposium on Signal Processing and Information Technology (ISSPIT 2002), 18-21 December, 2002, Marrakech (Marocco), pp. 277-282, ISBN 0-9727186-0-5, 2019
With real-time certificate validation checking, a public-key-using system that needs to validate a certificate executes a transaction with a specialized validation party. At the end of the transaction the validation party returns an indication about the validity status of the certificate.
arxiv  

Fast Cross-Validation via Sequential Testing [PDF]

, 2015
With the increasing size of today's data sets, finding the right parameter configuration in model selection via cross-validation can be an extremely time-consuming task.
Braun, Mikio, Krueger, Tammo, Panknin, Danny   +2 more
core