BACKGROUND The Health and Retirement Study is a national sample of Americans older than 50 years and their spouses. The present study evaluated cross-sectional and longitudinal data from January 2000 through December 2006. The objective of the study was to evaluate the roles of spouse-rated vs self-rated health as predictors of all-cause mortality among adults older than 50 years. METHODS A t...

correct estimation of suspended sediment transported by a river is an important practice in water structure design, environmental problems and water quality issues. conventionally, sediment rating curve used for suspended sediment estimation in rivers. in this method discharge and sediment discharge or concentration related using regression relation that generally is exponential model. respect ...

OBJECTIVE Endovascular robotics systems, now approved for clinical use in the United States and Europe, are seeing rapid growth in interest. Determining who has sufficient expertise for safe and effective clinical use remains elusive. Our aim was to analyze performance on a robotic platform to determine what defines an expert user. METHODS During three sessions, 21 subjects with a range of en...

BACKGROUND Redundant training and feedback are crucial for successful acquisition of skills in simulation trainings. It is still unclear how or how much feedback should best be delivered to maximize its effect, and how learners' activity and feedback are optimally blended. To determine the influence of high- versus low-frequency expert feedback on the learning curve of students' clinical proced...

In flood management it is important to reliably estimate the discharge in a river. Hydrologists use historic data to establish a rating curve – a relationship between the water level (stage) and discharge. ANN and M5 model trees were used to reconstruct this relationship on an example of an Indian river. The predictive accuracy of these machine learning methods models was found to be superior t...

ABSTRACT Maximum flows are often estimated from flood frequency analysis, by means of the statistical fitting a theoretical probability distribution to maximum annual flow data. However, because limitations imposed practice at-site measurement, empirical models applied as rating curve for estimating streamflow. These curves approximations actual and incorporate different sources uncertainty, es...