共查询到20条相似文献，搜索用时 927 毫秒
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胡宏昌 《周口师范学院学报》2008,25(5)
考虑半参数回归模型y1=XTi β g(ti) εi.基于用小波的方法处理非参数分量的基础上,研究了该模型的M估计,得到了参数及非参数分量的线性强表示,并研究了这些表示在收敛速度、重对数律及Berry-Esseen型界限的应用. 相似文献
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考虑如下纵向数据半参数回归模型：yij=xijβ＋g（xij）＋еij,i=1,2,…,n,j=1,2,…,mi,结合现有文献,利用最小二乘法和非参数权函数估计方法给出了模型中参数分量β,回归函数g（.）和误差方差σ2的估计量形式,并在适当条件下,证明了它们的r（r≥2）阶平均相合性。这些结果是截面数据半参数回归模型yi=xiβ＋g（xi）＋еii=1,2,…,n,的研究基础上的推广。 相似文献
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考虑非参数方差模型Yi=σ(xi)εi,i=1,2,…,n,其中xi是固定设计点列,{εi}是严平稳α-混合序列.该文利用小波方法构造了方差函数σ2(x)的估计量,在设定的假设条件下,讨论了其小波估计的有偏性、方差和相合性. 相似文献
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考虑纵向数据半参数回归模型:Y=Xβ g(T) ε,采用二阶段估计方法给出了参数分量β和非参数分量g(t)的估计量^βN和^gN(t),并在适当条件下研究了这些估计量的渐近正态性. 相似文献
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考虑纵向数据半参数回归模型:Y=Xβ+g(T)+ε,基于最小二乘法和局部线性拟合的方法建立了模型中参数分量β,回归函数g(·)和误差方差σ2的估计量,并在适当条件下得到了它们的渐近正态性和最优收敛速度. 相似文献
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考虑如下纵向数据部分线性模型:yij=x'ijβ+g(xij)+eij·采用最小二乘法和非参数概率权函数估计方法得到模型中参数分量卢和非参数分量g(·)的估计,并在适当条件下证明了参数分量估计量的渐近正态性和非参数分量估计量的最优弱收敛速度. 相似文献
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考虑固定设计下的半参数回归模型：ｙｉ＝ｘｉβ＋ｇ（ｔｉ）＋ｅｉ,ｉ＝１,．．．,ｎ对利用一般非参数估计法结合最小二乘法得到的参数分量β和误差方差σ＾２的估计量βｎ和σｎ＾２,本文用随机加权法构造了βｎ和σ＾２ｎ的随机加权统计量Ｈβｎ和Ｈσｎ＾２,并证明了在给定原样本的条件下Ｈβｎ和Ｈσ＾２ｎ分别与√ｎ（βｎ－β）和μｎ（σ＾２ｎ＝σ＾２）有相同的渐近分布。 相似文献
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非线性系统卡尔曼滤波新方法 总被引：1，自引：0，他引：1
为了在非线性、非高斯系统估计中获得更好的精度,提出一种新的unscented卡尔曼滤波(UKF).采用确定性采样方法,通过选择unscented变换中的参数α＝0.85,β＝2和l＝0,确定出2n 1个σ点,使这些σ点完全符合非线性系统Yi＝F(Xi)的高斯随机变量的均值和方差.仿真结果表明:σ点通过实际的非线性系统Yi＝F(Xi)传递后,其后验均值和协方差可以达到泰勒展开式的三阶精度,广义卡尔曼滤波(EKF)只能达到一阶精度.该UKF滤波与EKF算法复杂度相近,但具有比EKF更好的估计精度. 相似文献
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在线性回归模型Y=Xβ+ε;E(ε)=0;cov=σ2Σ;Σ>0下给出了有偏估计β*(K,d)=(XTΣ-1X+K)-1(XTΣ-1Y+dβ*),其中K>0,d>0为参数,β*表示线性回归模型的广义最小二乘估计,讨论了这种有偏估计的优良性质,得出了主要结论. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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