2003

最新文章

• On ψ-learning AI翻译
  作者：Shen, XT; Tseng, GC; Zhang, XG; Wong, WH
  作者单位：University System of Ohio; Ohio State University; University of Minnesota System; University of Minnesota Twin Cities; Pennsylvania Commonwealth System of Higher Education (PCSHE); University of Pittsburgh; Tsinghua University; Harvard University; Harvard T.H. Chan School of Public Health
  摘要：The concept of large margins have been recognized as an important principle in analyzing learning methodologies, including boosting, neural networks, and support vector machines (SVMs). However, this concept alone is not adequate for learning in nonseparable cases. We propose a learning methodology, called psi-learning, that is derived from a direct consideration of generalization errors. We provide a theory for psi-learning and show that it essentially attains the optimal rates of convergence...
• The distribution of realized exchange rate volatility (vol 96, pg 43, 2001) AI翻译
  作者：Andersen, TG; Bollerslev, T; Diebold, FX; Labys, P
• Semiparametric regression for the area under the receiver operating characteristic curve AI翻译
  作者：Dodd, LE; Pepe, MS
  作者单位：National Institutes of Health (NIH) - USA; NIH National Cancer Institute (NCI); University of Washington; University of Washington Seattle
  摘要：Medical advances continue to provide new and potentially better means for detecting disease. Such is true in cancer, for example, where biomarkers are sought for early detection and where improvements in imaging methods may pick up the initial functional and molecular changes associated with cancer development. In other binary classification tasks, computational algorithms such as neural networks, support vector machines, and evolutionary algorithms have been applied to areas as diverse as cre...
• Multiple edit/multiple imputation for multivariate continuous data AI翻译
  作者：Ghosh-Dastidar, B; Schafer, JL
  作者单位：RAND Corporation; Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park
  摘要：Multiple imputation replaces an incomplete dataset with m > 1 simulated complete versions that are analyzed separately by standard methods. We present a natural extension of multiple imputation for handling the dual problems of nonresponse and response error. This extension, which we call multiple edit/multiple imputation (MEMI), replaces an observed dataset containing missing values and errors with m > 1 simulated versions of the ideal dataset that is complete and error-free. These ideal data...
• Determining inheritance distributions via stochastic penetrances AI翻译
  作者：Hössjer, O
  作者单位：Stockholm University
  摘要：The aim of linkage analysis is to map the position of a gene contributing to an inheritable disease. The statistical model contains the disease allele frequency and penetrance parameters. Here I investigate the inheritance distribution, that is, the conditional distribution of the inheritance vector given phenotypes at the disease locus. Based on this, the likelihood and likelihood score function of Whittemore can be defined. As a result, a general semiparametric methodology of choosing score ...
• Infilling sparse records of spatial fields AI翻译
  作者：Johns, CJ; Nychka, D; Kittel, TGF; Daly, C
  作者单位：University of Colorado System; University of Colorado Denver; National Center Atmospheric Research (NCAR) - USA; Oregon State University
  摘要：Historical records of weather, such as monthly precipitation and temperatures from the last century, are an invaluable database to use in studying changes and variability in climate. These data also provide the starting point for understanding and modeling the relationship among climate, ecological processes, and human activities. However, these data are observed irregularly over space and time. The basic statistical problem is to create a complete data record that is consistent with the obser...
• Discussion: Inference and interpretability considerations in frequentist model averaging and selection AI翻译
  作者：Shen, XT; Dougherty, DP
  作者单位：University System of Ohio; Ohio State University; University of Minnesota System; University of Minnesota Twin Cities; University System of Ohio; Ohio State University
• Discussion: Performance of Bayesian model averaging AI翻译
  作者：Raftery, AE; Zheng, YY
  作者单位：University of Washington; University of Washington Seattle; Fred Hutchinson Cancer Center
• Wavelet-based nonparametric modeling of hierarchical functions in colon carcinogenesis - Comment AI翻译
  作者：Wu, CO; Huang, JHZ
  作者单位：National Institutes of Health (NIH) - USA; NIH National Heart Lung & Blood Institute (NHLBI); University of Pennsylvania
• Principal stratification approach to broken randomized experiments: A case study of School Choice vouchers in New York City AI翻译
  作者：Barnard, J; Frangakis, CE; Hill, JL; Rubin, DB
  作者单位：Columbia University; Harvard University; Johns Hopkins University
  摘要：The precarious state of the educational system in the inner cities of the United States, as well as its potential causes and solutions, have been popular topics of debate in recent years. Part of the difficulty in resolving this debate is the lack of solid empirical evidence regarding the true impact of educational initiatives. The efficacy of so-called school choice programs has been a particularly. contentious issue. A current multimillion dollar program,,the School Choice Scholarship Founda...