2,638 research outputs found
Tensor-to-Scalar Ratio in Eddington-inspired Born-Infeld Inflation
We investigate the scalar perturbation of the inflation model driven by a
massive-scalar field in Eddington-inspired Born-Infeld gravity. We focus on the
perturbation at the attractor stage in which the first and the second slow-roll
conditions are satisfied. The scalar perturbation exhibits the corrections to
the chaotic inflation model in general relativity. We find that the
tensor-to-scalar ratio becomes smaller than that of the usual chaotic
inflation.Comment: 9 pages. revised version to appear in EPJC, with minor typo
corrections. arXiv admin note: text overlap with arXiv:1404.608
Predoctoral Dental Students’ Perceptions of Dental Implant Training: Effect of Preclinical Simulation and Clinical Experience
The aims of this study were to assess 1) differences in perceptions of dental implant training between dental students who received didactic training alone (control group) and those who received didactic plus simulation training (test group); 2) differences in response between students with and without clinical experience in implant dentistry; and 3) the interaction effect of simulation training and clinical experience on students’ satisfaction. A survey was distributed to the control group in 2014 and to the test group in 2015; both groups were at the same U.S. dental school. Data were collected on confidence levels with various implant restorative procedures along with overall satisfaction and number of implant restorations performed by each student. The response rate was 78.7% in the control group and 81.3% in the test group. In the control group, 85.7% of students reported being satisfied with implant training compared to 90.8% of students in the test group. The interaction effect of simulation training and clinical experience on overall student satisfaction was OR=1.5 at 95% CI: 0.8, 3.0. The students who had clinical experience with implant restorative procedures had significantly greater satisfaction than those who did not (OR=4.8, 95% CI: 2.1, 11.1,
Bayesian Decision Theoretic Approach to Directional Multiple Hypotheses Problems
A multiple hypothesis problem with directional alternatives is considered in a decision theoretic framework. Skewness in the alternatives is considered, and it is shown that this skewness permits the Bayes rules to possess certain advantages when one direction of the alternatives is more important or more probable than the other direction. Bayes rules subject to constraints on certain directional false discovery rates are obtained, and their performances are compared with a traditional FDR rule through simulation. We also analyzed a gene expression data using our methodology, and compare the results to that of a FDR method
Empirical Bayes and Hierarchical Bayes Estimation of Skew Normal Populations
We develop empirical and hierarchical Bayesian methodologies for the skew normal populations through the EM algorithm and the Gibbs sampler. A general concept of skewness to the normal distribution is considered throughout. Motivations are given for considering the skew normal population in applications, and an example is presented to demonstrate why the skew normal distribution is more applicable than the normal distribution for certain applications
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