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AR模型阶数依平方损失函数下的Bayes估计 总被引:4,自引:0,他引:4
本文在假定模型阶数K有已知上界、并为离散随机变量,且具有一定的先验概率函数的情况下,讨论了在平方损失下AR模型阶数的Bayes估计,并证明了所给的估计量是有一致性的估计。 相似文献
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从两个方面说明牛顿迭代法优于预测式迭代法:1.牛顿迭代法的收敛阶数高于预测式迭代法的收敛阶数。2·从算法复杂性出发,采用Ostrowski给出的“迭代过程有效性指标的概念,得到牛顿迭代法的有效性指标是2^1/3,预测式迭代法的有效性指标是3^1/3. 相似文献
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迭代方法是求解非线性方程近似根的重要方法.本文基于隐函数存在定理,提出了一种新的迭代方法收敛性和收敛阶数的证明方法,并分别对牛顿(Newton)和柯西(Cauchy)迭代方法迭代收敛性和收敛阶数进行了证明.最后,利用本文提出的证明方法,证明了基于三次泰勒(Taylor)展式构成的迭代格式是收敛的,收敛阶数至少为4,并提出猜想,基于n次泰勒展式构成的迭代格式是收敛的,收敛阶数至少为(n+1). 相似文献
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王世光 《纯粹数学与应用数学》1991,7(2):118-120
记在E={z:|z|<1}内解析,形如f(z)=z+a_2z~2+…的函数全体为A。如果f(z)∈A满足Re{zf’(z)/f(z)}>0,则称f(z)为星形函数,其全体记为S~*。如果f(z)∈A满足 相似文献
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基于Thiele连分式,重新建立了求解非线性方程的经典的Newton迭代公式.为了避免求导数运算,采用差商可以近似代替导数的办法,得到Newton迭代方法的几个变体并给出了其收敛的阶数.最后,数值实例证实了这些迭代格式是有效的. 相似文献
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In this paper we consider the order of strongly starlikeness in the classes uniformly convex functions. 相似文献
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某些Banach空间的有限阶光滑点和强光滑点(英) 总被引:2,自引:0,他引:2
本文给出l∞(X)以及L(l1(X),Y),L(X,l∞(Y))和L(X,c0(Y))的单位球的有限阶光滑点和强光滑点的充要条件,这里X和Y都是任意的Banach空间.特别地,本文给出这些空间的单位球的光滑点和强光滑点的充要条件. 相似文献
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Let pj ∈ N and pj≥ 1, j = 2, ···, k, k ≥ 2 be a fixed positive integer. We introduce a Roper-Suffridge extension operator on the following Reinhardt domain ΩN ={z =(z1, z′2, ···, z′k)′∈ C × Cn2×···× Cnk: |z1|2+ ||z2||p22+ ··· + ||zk ||pk k 1} given11 by F P′j(zj),(f(z1))p2 z′2, ···,(f′(z1))pk z′k)′, where f is a normaljized biholomorphic function k(z) =(f(z1) + f′(z1)=2 on the unit disc D, and for 2 ≤ j ≤ k, Pj : Cnj-→ C is a homogeneous polynomial of degree pj and zj =(zj1, ···, zjnj)′∈ Cnj, nj ≥ 1, pj ≥ 1,nj1||zj ||j =()pj. In this paper, some conditions for Pjare found under which the loperator p |zjl|pj=1reserves the properties of almost starlikeness of order α, starlikeness of order αand strongly starlikeness of order α on ΩN, respectively. 相似文献
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We introduce the class of strongly close-to-convex mappings of order c~ in the unit ball of a complex Banach space, and then, we give the sharp distortion theorems for this class of mappings in the unit ball of a complex Hilbert space X or the unit polydisc in Cn. As an application, a sharp growth theorem for strongly close-to-convex mappings of order α is obtained. 相似文献
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Nursel etin 《Mathematical Methods in the Applied Sciences》2019,42(16):5582-5594
In this paper, we investigate approximation properties of the complex form of an extension of the Bernstein polynomials, defined by Stancu by means of a probabilistic method. We obtain quantitative upper estimates for simultaneous approximation and the exact order of approximation by these operators attached to analytic functions in closed disks. Also, we prove that the new generalized complex Stancu operators preserve the univalence, starlikeness, convexity, and spirallikeness in the unit disk. 相似文献
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We establish some new criteria for the oscillation of even order nonlinear dynamic equation. We study the case of strongly super-linear and the case of strongly sub-linear subject to various conditions. 相似文献
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This paper discusses some properties of two classes Vk[α,β] and Rk[α,β ]. Sharp distortion theorem and radius of convexity and starlikeness are obtained. Hadamard product of functions in the classes are also studied. 相似文献
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A normalized analytic function f defined on the open unit disk in the complex plane is in the class SL if zf′(z)/f(z) lies in the region bounded by the right-half of the lemniscate of Bernoulli given by ∣w2 − 1∣ < 1. In the present investigation, the SL-radii for certain well-known classes of functions are obtained. Radius problems associated with the left-half plane are also investigated for these classes. 相似文献