Who captures the marks for the Petersen estimator?

Summary.  We examine the claim that the well-known Petersen estimator which is used in population size estimation was not in fact used by the scientist after whom it is named. We show how, in the early years of the last century, the modern use of the Petersen estimator grew from that of the fishing coefficient. Contending with the somewhat conflicting claims that were made at the time, and what by modern standards is poor referencing of sources, we investigate where the credit lies for these concepts, and the principles and protocols which support them. We assess also how far attributions of credit were affected by practical considerations, and the history of the estimator by the nature of the problems being pursued. We identify scientists whose early work on marking and estimating fish populations deserves more credit than it has received.     

进口对辽宁省经济增长贡献度的实证分析——基于时变参数卡尔曼滤波的估计

为了探寻辽宁对外经济发展的合理模式，从进口与经济增长间的关系入手，选用1985～2007年辽宁省的进口和地区生产总值数据，利用时变参数的分析方法对二者进行相关性分析，得出了进口对辽宁省的经济增长存在促进作用，而且这种作用随时递增的结论。因此，辽宁省应充分发挥进口对经济增长的积极作用，以快速实现辽宁老工业基地的振兴。     

m阶积分算子及其应用

本文引人m阶积分算子，给出函数乘积u（x）．v（x）的m阶积分公式，此公式将函数乘积u(X)．v（x）的n阶导数的Leibniz公式推广到n为负整数情形，此公式同时也是函数f（x）的Taylor公式及Taylor级数的一种推广．     

棘腹蛙性腺的发育与周年变化

本文讨论了湘西棘腹蛙的性腺发育与性腺成熟系数的季节变化。实验材料来自204只幼蛙和成蛙（其中雌蛙122只，雄蛙82只）。卵巢的发育可分为6期，雌性的性成熟年龄为3年；精巢的发育可分为5期，雄性的性成熟年龄为2年。每年的5～8月为棘腹蛙的繁殖季节。同时，在文章中也描述了发育各期生殖细胞的主要形态结构。     

An alternative estimator for multiple characteristics in PPS sampling

The problem considered relates to large-scale sample surveys. A new estimator of population total for the characteristics that are poorly correlated with the selection probabilities has been developed for the PPSWR sampling scheme. The relative efficiency of the proposed estimator has been studied under a super-population model. A numerical investigation into the performance of the estimator has also been made.     

东西部公路使用效益的结构方程模型

为了解东西部地区公路线路基础设施使用效益的差异,从宏观层面建立了东西部地区客货运量与不同等级公路之间的结构方程模型,实证分析了东西部地区不同等级公路的使用效益。分析表明：东部地区除等外级公路以外,其他各等级公路的使用效益均高于西部地区;东部地区公路线路基础设施对货运量和货运周转量的效应均较大,西部地区公路线路基础设施对客运周转量的效应较大;由于经济发展阶段和产业结构特点不同,收费政策对东西部地区高速公路的使用效益产生了不同的影响。     

COVARIANCE MODELS FOR LATTICE DATA

Given observations on an m × n lattice, approximate maximum likelihood estimates are derived for a family of models including direct covariance, spatial moving average, conditional autoregressive and simultaneous autoregressive models. The approach involves expressing the (approximate) covariance matrix of the observed variables in terms of a linear combination of neighbour relationship matrices, raised to a power. The structure is such that the eigenvectors of the covariance matrix are independent of the parameters of interest. This result leads to a simple Fisher scoring type algorithm for estimating the parameters. The ideas are illustrated by fitting models to some remotely sensed data.     

CONDITIONAL INFERENCE ABOUT AN EQUICORRELATION COEFFICIENT

SenGupta (1987) proposed a locally most powerful test which is globally (one sided) unbiased, and an estimator of p, the equicorrelation coefficient of a standard symmetric multivariate normal (SSMN) distribution. Here we use the idea in Williams (1984) to illustrate the construction and use of ancillary statistics to make inference about p. The test and confidence intervals based on this construction are conditionally optimal.     

阵列通道误差校正算法及DSP实现

阵列通道幅相不一致性严重影响测向性能。基于辅助源的相关校正理论,研究了通过在天线馈电口输入辅助信号,再对信号求相关来实现对阵列通道不一致性的校正;并分析了基于多基线数字干涉仪体制的测向原理,利用五元圆形天线阵列估计出了地面目标的到达角。此外,还讨论了所有算法的DSP实现,计算机模拟证实了方法的有效性。     

核事故早期应急群决策模型研究

有效快速的核事故早期应急决策,是核电站发生核事故后最后一道必要的屏障,因此决策的快速性与有效性至关重要。文章先构造效用函数,求出决策者的乐观系数,将决策判断矩阵中的区间值与模糊值精确化;在此基础上建立了个体与群体的决策模型,以提高决策的有效性。同时根据排序结果,构造群体与个体之间一致性判断矩阵,并根据判断矩阵进行交互与修改,使专家内部快速达成一致。最后通过算例说明方法的可行性。