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731.
Graduate students simulated school board members making decisions about educational programs. Situation contexts within the program evaluation reports were varied by conflict (high, low), quality (high, low), and time (long, short). Analyses of Variance (ANOVA) of the qualitative measures m the 2 × 2 × 2 factorial design indicated significant results at the .01 level. The quality of decisions affect support for program continuation. Interactions of conflict and quality affected need for more information and more time in decision making. A conflict and time interaction affected preference to talk to other board members. Changes in situational contexts affected information need and use in small, decision making groups. 相似文献
732.
A.K.Md.Ehsanes Saleh M.Masoom Ali Dale Umbach 《Journal of statistical planning and inference》1983,8(1):75-86
Some general asymptotic methods of estimating the quantile function, Q(ξ), 0<ξ<1, of location-scale families of distributions based on a few selected order statistics are considered, with applications to some nonregular distributions. Specific results are discussed for the ABLUE of Q(ξ) for the location-scale exponential and double exponential distributions. As a further application of the exponential results, we discuss a nonlinear estimator of Q(ξ) for the scale-shape Pareto distribution. 相似文献
733.
Constance Van Eeden 《Revue canadienne de statistique》1995,23(3):245-256
Let X have a gamma distribution with known shape parameter θr;aL and unknown scale parameter θ. Suppose it is known that θ ≥ a for some known a > 0. An admissible minimax estimator for scale-invariant squared-error loss is presented. This estimator is the pointwise limit of a sequence of Bayes estimators. Further, the class of truncated linear estimators C = {θρ|θρ(x) = max(a, ρ), ρ > 0} is studied. It is shown that each θρ is inadmissible and that exactly one of them is minimax. Finally, it is shown that Katz's [Ann. Math. Statist., 32, 136–142 (1961)] estimator of θ is not minimax for our loss function. Some further properties of and comparisons among these estimators are also presented. 相似文献
734.
A formulation of the problem of detecting outliers as an empirical Bayes problem is studied. In so doing we encounter a non-standard empirical Bayes problem for which the notion of average risk asymptotic optimality (a.r.a.o.) of procedures is defined. Some general theorems giving sufficient conditions for a.r.a.o. procedures are developed. These general results are then used in various formulations of the outlier problem for underlying normal distributions to give a.r.a.o. empirical Bayes procedures. Rates of convergence results are also given using the methods of Johns and Van Ryzin (1971, 1972). 相似文献
735.
针对射孔对水力压裂过程中的破裂压力以及裂缝形态的问题,通过建立不同射孔方位和不同远场主应力条件下裂缝扩展模型,将位移不连续方法(DDM)应用于水力压裂过程中的力学分析研究,同时在裂缝扩展准则上运用修正了的G准则—F准则并进行裂缝扩展规律研究。根据不同射孔方位和不同远场主应力条件下裂缝扩展的模拟计算,在地应力大小和方位确定的情况下,破裂压力随着射孔方位的增大而升高,并且随着方位角的增大,裂缝形态会发生转向,而且裂缝壁面粗糙,会增大压裂液摩阻。对于实际的射孔参数优化设计和压裂施工具有参考意义 相似文献
736.
737.
R.S. Singh 《Journal of statistical planning and inference》1978,2(1):53-62
This paper deals with a sequence-compound estimation. The component problem is the squared error loss estimation of θ?[a,b] based on an observation X whose p.d.f. is of the form . For each a class of sequence-compound estimators is exhibited whose compound risk (average of risks) up to stage n differs from the Bayes envelope (in the component problem) w.r.t. the empiric distribution Gn of the parameters involved up to stage n by a quantity of order O(n?δt) for a δ>0. It is also shown that at any stage i the difference of the risk of ψ?i and the risk of the Bayes response w.r.t. Gi?1 is O(i?δt). Examples of the above type of families are given where δ is min{1,} and t is arbitrarily close to . Here it may be worthwhile to mention that a rate or better has not yet been obtained even in a very special family of densities. 相似文献
738.
Kurt Hoffmann 《Statistics》2013,47(3):185-187
In the linear regression model the unknown parameter vector θ is supposed to vary in a known ellipsoid. Under this parameter constraint Kuks and Olman derived an estimator by demanding a minimax property. Since sometimes the Kuks-Olman estimator takes values outside of the ellipsoid a modification is proposed in the paper. It is shown that this modified variant is a least squares estimator in the restricted model. 相似文献
739.
We propose a study of asymptotic properties in an extension of the Nelder-Wedderburn generalized linear models (GLM) and we apply the results to a model choice in Mandel's models of analysis of variance (ANOVA). This study concerns the behaviour of the maximum likelihood estimators (MLE) when the scale parameter of the GLM tends to zero. Finally, to allow the use of our results, we give some specifications of this limit in three cases of the GLM. 相似文献
740.