Mobile technologies applied through a variation of devices ranging from smart phones, netbooks and tablets, are developing quite fast and are expanding continuously. Users and media consumers interact increasingly nowadays which such devices, whose inbuilt functions and services are continuously developing and advancing. Based on this fact, this paper deals with the process, analysis, results a...

In the context of Statistical Disclosure Control, microaggregation is a privacy preserving method aimed to mask sensitive microdata prior to publication. It iteratively creates clusters of, at least, k elements, and replaces them by their prototype so that they become k-indistinguishable (anonymous). This data transformation produces a loss of information with regards to the original dataset wh...

These notes are based on the two lectures1 I gave in Stat 501, Probability Theory I, as a substitute for Professor Cheng Ouyang. There is a brief discussion of the so-called “basic grouping lemma” concerning independent σ-algebras, followed by a more detailed discussion of the Borel–Cantelli lemma, some applications, and some elaborations on independence. Independence, and the basic grouping le...

One of the more important but often overlooked parts of statistical analysis is the very first step—an exploratory and descriptive analysis. Typically, researchers take a quick look at the data and then dive into more complex regression models or t tests. In this column, I discuss preliminary analysis in general and look at some techniques less well known than others, but which provide interest...

Learning is the process of generating useful information from a huge volume of data. Learning can be either supervised learning (e.g. classification) or unsupervised learning (e.g. Clustering) Clustering is the process of grouping a set of physical objects into classes of similar object. Objects in real world consist of both numerical and categorical data. Categorical data are not analyzed as n...

This study investigates the tracking facilitation effect during categorical distinction between targets and distractors in the Multiple Identity Tracking task. We asked observers to track four targets in a total of eight moving objects, and manipulated categorical distinctions of targets and distractors across four experiments, with different combinations of inter-category and intra-category di...

Introduction: HIV counseling and testing is the vital and preliminary interventional step aimed at reducing the spread of HIV infection. The study was designed to determine the attitude of health care professionals towards voluntary counseling and testing (VCT) for HIV/AIDS at Irrua Specialist Teaching Hospital. Materials & Methods: In this descriptive cross sectional prospective study a sel...