Consider a study whose design calls for the study subjects to be followed from enrollment (time t = 0) to time t = T , at which point a primary endpoint of interest Y is to be measured. The design of the study also calls for measurements on a vector V(t) of covariates to be made at one or more times t during the interval [0, T ). We are interested in making inferences about the marginal mean μ0...

Maloney and Ahumada [9] have proposed a network learning algorithm that allows the visual system to compensate for irregularities in the positions of its photoreceptors. Weights in the network are adjusted by a process tending to make the internal image representation translationinvariant. We report on the behavior of this translation-invariance algorithm calibrating a visual system that has lo...

The demand for low-voltage, low drop-out (LDO) regulators is increasing because of the growing demand for portable electronics, i.e., cellular phones, pagers, laptops, etc. LDO’s are used coherently with dc-dc converters as well as standalone parts. In power supply systems, they are typically cascaded onto switching regulators to suppress noise and provide a low noise output. The need for low v...

A 3-5V 50mA CMOS low Drop-out (LDO) linear regulator with a single compensation capacitor of 1pF is presented. The circuit realization is well-studied and developed with respect to the loop-gain response, the transient response, the output noise, the output accuracy, as well as the standby power consumption. The proposed LDO regulator is implemented in the AMI 0.6um CMOS process, the active lay...

BACKGROUND The bias caused by drop-out is an important factor in large population-based epidemiological studies. Many studies account for it by weighting their longitudinal data, but to date there is no detailed final approach for how to conduct these weights. METHODS In this study we describe the observed longitudinal bias and a three-step longitudinal weighting approach used for the longitu...

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Peritoneal dialysis (PD) as a renal replacement therapy (RRT) has become wide spread since its inception more than twenty-five years back. Since then, several advances have been made and PD has been accepted as an alternative therapy to hemodialysis (HD), with excellent survival, lower cost, and improved quality of life. In spite of comparable survival of HD and PD, improved PD techniques over ...

Individual Development Accounts (IDAs) are a new policy instrument designed to help the poor save and accumulate assets. IDAs provide matches for savings used for home purchase, post-secondary education, or microenterprise. IDAs cannot help participants, however, if they drop out. What determines drop-out, and what can be done to help participants to stay in? Three findings emerge from an analy...

Student retention is an important measure for higher education institutions. Exploration and interactive visualization of multivariate data without significant reduction of dimensionality remains a challenge. Visual analytics tools like Motion Charts show changes over time by presenting animations within twodimensional space and by changing element appearances. In this paper, we present a new v...

In actual sequential auctions, 1) bidders typically incur a cost in continuing from one sale to the next, and 2) bidders decide whether or not to continue. To investigate the question "why do bidders drop out," we define a sequential auction model with continuation costs and an endogenously determined number of bidders at each sale, and we characterize the equilibria in this model. Simple examp...