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The correlated and shared gamma frailty model for bivariate current status data: An illustration for cross-sectional serological data Hasselt University KU Leuven University of Antwerp
Frailty models are often used to study the individual heterogeneity in multivariate survival analysis. Whereas the shared frailty model is widely applied, the correlated frailty model has gained attention because it elevates the restriction Of unobserved factors to act similar within clusters. Estimating frailty models is not straightforward due to various types of censoring. In this paper, we Study the behavior of the bivariate-correlated gamma ...
Parametric overdispersed frailty models for current status data. Hasselt University University of Antwerp KU Leuven
Frailty models have a prominent place in survival analysis to model univariate and multivariate time-to-event data, often complicated by the presence of different types of censoring. In recent years, frailty modeling gained popularity in infectious disease epidemiology to quantify unobserved heterogeneity using Type I interval-censored serological data or current status data. In a multivariate setting, frailty models prove useful to assess the ...
The nonparametric bootstrap for the current status model Hasselt University
It has been proved that direct bootstrapping of the nonparametric maximum likelihood estimator (MLE) of the distribution function in the current status model leads to inconsistent confidence intervals. We show that bootstrapping of functionals of the MLE can however be used to produce valid intervals. To this end, we prove that the bootstrapped MLE converges at the right rate in the L-p-distance. We also discuss applications of this result to ...
On the correlated frailty model for bivariate current status data Hasselt University
Individual heterogeneity (Coutinho et al., 1999) comprises the differences among individuals susceptibility to acquire infections, often referred to as 'frailties'. In its origin studying individual differences was done in the context of susceptibility to death. In epidemic theory, Coutinho et al.(1999) were the first to systematically treat heterogeneity in the acquisition of infections. Individuals are dissimilar in the way they acquire ...
Current status linear regression Hasselt University
We construct √n-consistent and asymptotically normal estimates for the finite dimensional regression parameter in the current status linear regression model, which do not require any smoothing device and are based on maximum likelihood estimates (MLEs) of the infinite dimensional parameter. We also construct estimates, again only based on these MLEs, which are arbitrarily close to efficient estimates, if the generalized Fisher information is ...
Confidence intervals for the current status model Hasselt University
We discuss a new way of constructing pointwise confidence intervals for the distribution function in the current status model. The confidence intervals are based on the smoothed maximum likelihood estimator, using local smooth functional theory and normal limit distributions. Bootstrap methods for constructing these intervals are considered. Other methods to construct confidence intervals, using the non-standard limit distribution of the ...
RNAi in termites (Isoptera) : current status and prospects for pest management Ghent University
Termites are keystone species and play an essential role in the ecosystem by decomposing plants and wood mate-rials with adapted endogenous and symbiotic cellulase systems to obtain food and energy. However, some termites are also pests that have significant economic impacts directly or indirectly on the agricultural system, such as pastures, orchards, nurseries, and eucalyptus forests, and globally the estimated loss is $40 billion annually. ...
Work safety in China's Thirteenth Five-Year plan period (2016-2020): Current status, new challenges and future tasks KU Leuven University of Antwerp
© 2018 Elsevier Ltd The problem of work safety greatly affects many parts of the world, especially developing countries such as China. The release of the Thirteenth Five-Year Guideline for National Economic and Social Development in March 2016 marked the beginning of China's Thirteenth Five-Year Plan (13th FYP) period (2016–2020). Work safety continues to be a national priority. Since the release, a newly important work safety policy, namely the ...
Status, current distribution and threats to the Fishing cat Prionailurus viverrinus (Bennett, 1833) in Nepal University of Antwerp
The Fishing cat, Prionailurus viverrinus is a medium-sized, wild felid, native to south and Southeast Asia. The global status of the species has been assessed as ‘Vulnerable’ by the IUCN Red List of Threatened Species and it is further listed as ‘Endangered’ in Nepal. Knowledge on the species is limited due to scarce research studies, resulting in a lack of ecological information. A few conservation programs for the species have been initiated ...