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51.
D. Firth C. Payne & J. Payne 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》1999,162(1):111-120
An evaluation is described of two UK Government programmes for the long-term unemployed in Great Britain, Employment Training and Employment Action, using discrete time hazard modelling of event histories. The study design employed a closely matched comparison group and carefully chosen control variables to minimize the effect of selection bias on conclusions. The effect of unobserved heterogeneity is investigated by using some standard random effect model formulations. 相似文献
52.
53.
中药有效成分的分析方法及应用 总被引:1,自引:0,他引:1
对中药有效成分分析的方法进行了综述,阐述了其特点、应用范围及研究现状,旨在为中药有效成分的分析工作提供参考。 相似文献
54.
The effects of non-normality on type-I and type-II errors in a one-way random model are investigated for moderate departures
from normality. It is found that the probabilities of both errors are more sensitive to the kurtosis of between group effects
than that of within group effects. 相似文献
55.
The estimation of variance-covariance matrices through optimization of an objective function, such as a log-likelihood function, is usually a difficult numerical problem. Since the estimates should be positive semi-definite matrices, we must use constrained optimization, or employ a parametrization that enforces this condition. We describe here five different parametrizations for variance-covariance matrices that ensure positive definiteness, thus leaving the estimation problem unconstrained. We compare the parametrizations based on their computational efficiency and statistical interpretability. The results described here are particularly useful in maximum likelihood and restricted maximum likelihood estimation in linear and non-linear mixed-effects models, but are also applicable to other areas of statistics. 相似文献
56.
Gareth M. James 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2002,64(3):411-432
Summary. We present a technique for extending generalized linear models to the situation where some of the predictor variables are observations from a curve or function. The technique is particularly useful when only fragments of each curve have been observed. We demonstrate, on both simulated and real data sets, how this approach can be used to perform linear, logistic and censored regression with functional predictors. In addition, we show how functional principal components can be used to gain insight into the relationship between the response and functional predictors. Finally, we extend the methodology to apply generalized linear models and principal components to standard missing data problems. 相似文献
57.
不同类型的内幕交易受害人取诉权的条件和方式不尽相同。内幕交易民事责任的各个构成要件都有其特定内涵。内幕交易民事诉讼机制由代表人诉讼和股东派生诉讼所构成。 相似文献
58.
André I. Khuri 《Journal of applied statistics》2005,32(9):887-908
Slack-variable models are compared against Scheffé's polynomial model for mixture experiments. The notion of model equivalence and the use of various diagnostic measures provide effective tools in making such comparisons, particularly when the experimental region is highly constrained. It is demonstrated that the choice of the best fitting model, through variable selection, depends on which mixture component is selected as a slack variable, and on the size of the fitted model. In addition, the equivalence of two well-known representations of a complete mixture model is shown to be valid. Two numerical examples are presented. 相似文献
59.
温州是我国外来务工人员最为集中的几个城市之一,但是由学理分析而得出的结论却是温州不仅不存在外来务工人员的就业空间,而且还要从其内部向外大量迁移人口。这种现实与理论的矛盾构成的“温州悖论”,其实可以通过“行政区经济”和“经济区经济”的分析框架而得到回归,由此也就说明了经济发展过程中块状经济对人口分布所具有的巨大效应。 相似文献
60.
李俊华 《河南教育学院学报(哲学社会科学版)》2003,22(1):113-115
绑架罪在主观上具有勒索财物或获取其他非法利益的目的,在客观上是由绑架行为和勒索财物或提出不法要求行为两方面组成的.新刑法规定绑架罪最低起点刑为10年和绝对死刑失之于严,应通过补充立法或修改刑法的立法方式重新规定. 相似文献