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451.
Murray D. Smith 《统计学通讯:理论与方法》2013,42(12):2213-2222
In multivariate and multi-parameter contexts, new expressions for Fisher Information are derived using the copula representation of the joint distribution of random variables. Invariance of Fisher Information to margins of the joint distribution is then demonstrated. 相似文献
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To assess the efficacy of a treatment, patients are administered a pre-test, the treatment, and a post-test (identical to the pre-test). These patients are then categorized according to their outcomes observed on both tests,e.g., (S,S), (S,F), etc. Also, we observe "incomplete" information on the pre-tests' outcomes for some patients and the results of only the post-test being known for thers, A Bayesian framework is fit to the problem and Bayes factors, posterior odds ratios, and utility functions are given to evaluate th e treatment, A method of assessing the prior distribution is specified and a numerical example is worked. 相似文献
454.
The object of this paper is the statistical analysis of Several Closely related models arising in water quality analysis. In particular, concern is with the autoregressive scheme Xr = ρXr?1 + Yr where 0 < ρ < 1 and Y's are i.i.d, and non-negative. The estimation and testing problem is considered for three parametric models - Gaussian, uniform and exponential - as well as for the nonparametric case where it is assumed that the Y's have a positive continuous distribution. 相似文献
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457.
H. Fairfield Smith 《The American statistician》2013,67(4):29-31
Rao ([1], p. 475, equation 8c.6.10) considers a certain minimization problem in which one is required to minimize a sum of quadratic forms subjected to certain linear restrictions. The proof given by Rao, although elegant, is involved and complicated as he uses N dimensional geometric and regression theory arguments. Perhaps, an alternative simpler and straightforward algebraic proof of this minimization problem might be of interest. 相似文献
458.
Melissa R.W. George Na Yang Jessalyn Smith Thomas Jaki Daniel J. Feaster 《Journal of Statistical Computation and Simulation》2013,83(4):759-772
Mild to moderate skew in errors can substantially impact regression mixture model results; one approach for overcoming this includes transforming the outcome into an ordered categorical variable and using a polytomous regression mixture model. This is effective for retaining differential effects in the population; however, bias in parameter estimates and model fit warrant further examination of this approach at higher levels of skew. The current study used Monte Carlo simulations; 3000 observations were drawn from each of two subpopulations differing in the effect of X on Y. Five hundred simulations were performed in each of the 10 scenarios varying in levels of skew in one or both classes. Model comparison criteria supported the accurate two-class model, preserving the differential effects, while parameter estimates were notably biased. The appropriate number of effects can be captured with this approach but we suggest caution when interpreting the magnitude of the effects. 相似文献
459.
Mary Roberts Smith M.S. 《Journal of the American Statistical Association》2013,108(31):219-262
460.
Vangelis Metsis Grayson Lawrence Mark Trahan Kenneth S. Smith Dan Tamir Katherine Selber 《Journal of Technology in Human Services》2019,37(1):32-50
AbstractVirtual reality (VR) has emerged as a promising technological intervention for anxiety disorders. However, there are no existing standards and best practices to evaluate the effectiveness of environments to achieve their intervention goals. The purpose of this study was to develop a VR intervention for student veterans with social anxiety disorder and test feasibility utilizing a three-stage development model. The development of a therapeutic VR environment may benefit from an interdisciplinary collaboration of researchers from various fields of study. Utilizing three stages of prototyping with two virtual reality platforms, fully immersive video (n?=?6) and three-dimensional (3-D) immersive virtual reality (n?=?8), the research team designed an intervention for student veterans with social anxiety disorder, testing bio-reactivity of participants. Results of prototyping include user feedback validating increased stress levels and increased bio-reactivity specifically in galvanic skin response and heart rate elevation. Implications include the use of 360° video for prototyping 3-D virtual reality interventions. 相似文献