基于多元线性回归的装饰工程快速估价模型

针对目前装饰工程陕速估价方法的不足，以及装饰工程造价组成的特点，建立一种基于多元线性回归的快速估价新模型。以住宅类建筑为例，建立其多元线性回归模型，结合SPSS软件对样本分析，结果表明，其线性回归模型显著，同时，内墙、外墙、楼地面和窗的回归系数也非常显著。通过计算回归值与实际值的误差，发现误差比较理想，该模型具有很好的实用价值。     

Validity of the Statistical Estimation

Conventional statistical methods of the estimation of population parameters are abstract and unreliable because these statistical methods are based on unwarranted assumptions.     

The Euro Changeover and Numerical Intuition for Prices in the Old and New Currencies

This study examines how numerical intuition for prices in euros and in the Portuguese currency escudos developed in Portugal after the euro changeover. Estimates of prices of 40 different products were collected in the two currencies and at four different times from November 2001 to April 2004. The results regarding price estimates in euros were more in accordance with a relearning hypothesis considering that price estimates become progressively more accurate by a process that is related to purchase frequency. It was also suggested that this is a very slow process and that prices in the former currency are not simply forgotten. On the contrary, the escudos remained a general benchmark for an extended period. The results regarding estimated price intuition and use of intuition in estimating prices are also consistent with a slow adaptation process. Implications for future euro changeovers are discussed.     

VAN DE HULST ON ROBUST STATISTICS: A HISTORICAL NOTE

This paper provides a discussion of an unpublished set of notes written in 1942 by the Dutch astronomer H.C. VAN DE HULST. In these notes VAN DE HULST derives the asymptotic variances of M– estimators as well as trimmed means and concludes that the asymptotic variance of what is now called HUBER'S estimator is the same as that of a trimmed mean. This conclusion is usually ascribed to BICKEL (1965). A letter written by D. VAN DANTZIG in 1943 providing a critical evaluation of. VAN DE HULST'S results, adds interest to this suprisingly early contribution to the theory of robust statistics.     

均匀圆阵的测向模糊研究

在高分辨阵列测向系统中,均匀圆阵(UCA)是一种广泛使用的阵列结构。利用均匀圆阵的阵列流形的微分几何作为分析工具,对实际中常用的几种均匀圆阵的测向模糊进行了大量的计算机仿真试验,定量地给出了这些阵列的测向模糊方向和相应的秩,揭示了均匀圆阵的测向模糊性能与其阵元数和孔径之间的关系,得出了一些有实际意义的结论。这对工程应用时均匀圆阵的选择和构造具有很强的参考价值和指导意义,可以避免系统设计的盲目性和随意性。     

Sequential point estimation of normal mean under LINEX loss function

A sequential point estimation of the mean of a normal distribution is considered under LINEX loss function. The regret of sequential procedures are obtained. Furthermore, it is shown that a sequential procedure with the sample mean as an estimate is asymptotically inadmissible. An accerelated stopping time is also considered. Received: December 1999     

Biases in demand analysis due to variation in retail distribution

Aggregate demand models typically assume that consumers choose between all available products. Since consumers may be unwilling to search across every store in a given market for a particular item, this assumption is problematic when product assortments vary across stores. Using supermarket scanner data for five product categories we demonstrate that approximately one third of products have limited retail distribution, which account for one fourth of dollar sales. Monte Carlo analysis demonstrates that the level of limited product availability observed in the data can significantly bias the results of aggregate demand models that incorrectly assume all consumers in a given market face the same choice set.     

雷达信号高精度参数估计及其DSP实现

研究了单脉冲、线性调频与相位编码雷达信号的调制类型识别与高精度参数估计算法,基于TMS320C6713搭建的硬件平台,完成了两个同时到达信号的高精度参数估计.测试结果表明,该系统能够处理两个同时到达信号,实测双信号处理时间为3 748 905 ns,频率测量误差小于10 kHz,处理速度与参数估计精度都能满足实际需要.     

Public Debt and Economic Growth in Emerging Market Economies

This paper empirically studies the relationship between public debt and economic growth for selected emerging market economies by performing panel data estimations. The results reveal a statistically significant positive correlation between public debt and the subsequent growth rate of per capita gross domestic product (GDP). Population and investment are also positively correlated with per capita growth, whereas the initial level of real GDP per capita exerts a negative influence on growth, implying conditional convergence. Other variables such as the inflation rate, the trade balance or the exchange rate do not yield a statistically significant effect with respect to economic growth.