Two-dimensional projections of an hypercube

We present a method to project a hypercube of arbitrary dimension on the plane, in such a way as to preserve, as well as possible, the distribution of distances between vertices. The method relies on a Montecarlo optimization procedure that minimizes the squared difference between distances in the plane and in the hypercube, appropriately weighted. The plane projections provide a convenient way of visualization for dynamical processes taking place on the hypercube.Comment: 4 pages, 3 figures, Revtex

Kernel density classification and boosting: an L2 sub analysis

Kernel density estimation is a commonly used approach to classification. However, most of the theoretical results for kernel methods apply to estimation per se and not necessarily to classification. In this paper we show that when estimating the difference between two densities, the optimal smoothing parameters are increasing functions of the sample size of the complementary group, and we provide a small simluation study which examines the relative performance of kernel density methods when the final goal is classification. A relative newcomer to the classification portfolio is “boosting”, and this paper proposes an algorithm for boosting kernel density classifiers. We note that boosting is closely linked to a previously proposed method of bias reduction in kernel density estimation and indicate how it will enjoy similar properties for classification. We show that boosting kernel classifiers reduces the bias whilst only slightly increasing the variance, with an overall reduction in error. Numerical examples and simulations are used to illustrate the findings, and we also suggest further areas of research

Metode Survai Dalam Kedokteran Komonitas Pengantar Studi Epidemiologi Dan Evaluatif

vii.331 hal;21 c

Pengantar Studi Epidiomologo dan Evaluatif

vii.331 hlm;20 c

Metode survei dalam kedokteran komunitas / pengantar studi epidemiologi dan evaluatif

Indeks *** *** Bibliografi hlm. Setiap babviii, 344 hlm. ;21 cm

Metode survei dalam kedokteran komunitas: Pengantar studi epidemiologi dan evaluatif

viii, 344 hal; 21 c

Metode surve dalam kedokteran komunitas : pengantar studi epidemiologi dan evaluatif

Judul asli; Survey methode in community medicene an introduction to epidemological and evaluative studies344 p.; 21 cm

Natal medical students' attitudes to the social and preventive aspects of medicine

No Abstrac

Metode survei dalam kedokteran komunitas: pengantar studi epidemiologi dan evaluatif/ Abramson

ix, 344 hal.; .... cm