Results 41 to 50 of about 540,575 (323)
Covariate order tests for covariate effect.
Lifetime data analysis, 2002 A new approach for constructing tests for association between a random right censored life time variable and a covariate is proposed. The basic idea is to first arrange the observations in increasing order of the covariate and then base the test on a certain point process defined by the observation times.
openaire +4 more sources
Understanding covariate shift in model performance [version 3; referees: 2 approved]
F1000Research, 2016 Three (3) different methods (logistic regression, covariate shift and k-NN) were applied to five (5) internal datasets and one (1) external, publically available dataset where covariate shift existed.
Georgia McGaughey +2 more
doaj +1 more source
Annals of Medicine, 2021 Background We carried out this study to demonstrate the effects of outcome sensitivity, participant exclusions, and covariate manipulations on results of the epidemiological analysis of coronary heart disease (CHD) and its behaviour-related risk factors ...
Ari Voutilainen +3 more
doaj +1 more source
Mixture regression for observational data, with application to functional regression models [PDF]
, 2013 In a regression analysis, suppose we suspect that there are several heterogeneous groups in the population that a sample represents. Mixture regression models have been applied to address such problems.
Hoshikawa, Toshiya
core
Journal of Physics: Conference Series, 2011 9 pages, LaTeX2e (AMS-LaTeX); v2: minor ...
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Covariant Lyapunov vectors [PDF]
Journal of Physics A: Mathematical and Theoretical, 2013 The recent years have witnessed a growing interest for covariant Lyapunov vectors (CLVs) which span local intrinsic directions in the phase space of chaotic systems. Here we review the basic results of ergodic theory, with a specific reference to the implications of Oseledets' theorem for the properties of the CLVs.
Ginelli, Francesco +3 more
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Social context prevents heat hormetic effects against mutagens during fish development
FEBS Letters, EarlyView.This study shows that sublethal heat stress protects fish embryos against ultraviolet radiation, a concept known as ‘hormesis’. However, chemical stress transmission between fish embryos negates this protective effect. By providing evidence for the mechanistic molecular basis of heat stress hormesis and interindividual stress communication, this study ...
Lauric Feugere +5 more
wiley +1 more source
Bayesian Analysis of Hazard Regression Models under Order Restrictions on Covariate Effects and Ageing [PDF]
, 2007 We propose Bayesian inference in hazard regression models where the baseline hazard is unknown, covariate effects are possibly age-varying (non-proportional), and there is multiplicative frailty with arbitrary distribution.
Bhattacharjee, Arnab +1 more
core +4 more sources
Decline and repair, and covariate effects [PDF]
, 2015 The failure processes of repairable systems may be impacted by operational and environmental stress factors. To accommodate such factors, reliability can be modelled using a multiplicative intensity function.
Andersen +21 more
core +3 more sources
VISUALIZATION OF COVARIANCE AND CROSS-COVARIANCE FIELDS [PDF]
International Journal for Uncertainty Quantification, 2013 We present a numerical technique to visualize covariance and cross-covariance fields of a stochastic simulation. The method is local in the sense that it demonstrates the covariance structure of the solution at a point with its neighboring locations. When coupled with an efficient stochastic simulation solver, our framework allows one to effectively ...
Dongbin Xiu, Mike Kirby, Chao Yang
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