This paper considers the problem of detecting unknown bandpass acoustic transients in highly impulsive ambient noise such as that produced by snapping shrimp. Standard transient detection techniques apply the periodogram which is a classical direct nonparametric spectrum estimation method. The periodogram can be limited due to its poor bias properties resulting from substantial sidelobe leakage...

In the analysis of functional time series an object which has seen increased use is the long run covariance function. It arises in several situations, including inference and dimension reduction techniques for high dimensional data, and new applications are being developed routinely. Given its relationship to the spectral density of finite dimensional time series, the long run covariance is nat...

In a recent article in the Revista Española de Cardiologı́a, Cordero et al. reported a study of the concentrations of high-density lipoprotein cholesterol (HDL-C) in 959 unselected consecutive patients who were admitted for chest pain. The authors found that low levels of HDL-C (<40 mg/dL) were independently associated with diagnosis of acute coronary syndrome (ACS), that is, the lower the level...

For the problems of nonparametric estimation of nonincreasing and symmetric unimodal density functions with bounded supports we determine the projections of estimates onto the convex families of possible parent densities with respect to the weighted integrated squared error We also describe the method of approx imating the analogous projections onto the respective density classes satisfying som...

Tirapazamine (TPZ, 1, 3-amino-1,2,4-benzotriazine 1,4-N,N-dioxide), the radical anion 2 formed by one-electron reduction of 1, and neutral radicals 3 and 4 formed by protonation of 2 at O(N4) or O(N1), respectively, and their N-OH homolyses 3 → 5 + ·OH and 4 → 6 + ·OH have been studied with configuration interaction theory, perturbation theory, and density functional theory. A comprehensive com...

PURPOSE OF REVIEW Despite optimally reducing low-density lipoprotein cholesterol (LDL-C) levels to recommended targets using intensive statin therapy, the risk of cardiovascular disease (CVD) remains significant. Low levels of high-density lipoprotein cholesterol (HDL-C; <1.03 mmol/l or <40 mg/dl) are an independent risk factor for CVD, and raising levels of HDL-C is a major treatment strategy ...

In this paper we present a non parametric density-based data reduction technique designed to be used in robust parameter estimation problems. Existing approaches are focused on reducing the amount of data preserving the density function. In our case the reduction is oriented to automatically remove the samples that are considered non interesting while taking into account those that are meaningf...

SUMMARY This paper proposes an algorithm for boosting kernel density estimates. We show that boosting is closely linked to a previously proposed method of bias reduction and indicate how it should enjoy similar properties. Numerical examples and simulations are used to illustrate the findings, and we also suggest further areas of research.

Correspondence e-mail: [email protected] Density modification often suffers from an overestimation of phase quality, as seen by escalated figures of merit. A new cross-validation-based method to address this estimation bias by applying a bias-correction parameter ‘ ’ to maximumlikelihood phase-combination functions is proposed. In tests on over 100 single-wavelength anomalous diffract...