基于均值漂移法进行多光谱遥感聚类研究

传统的聚类方法大都是基于空间划分的方法,一般都假设数据符合混合高斯模型。这在实际应用中往往是不成立的。在大部分模式分类的问题中,常见的参数形式不适合实际遇到的概率密度,特别是所有经典的参数密度都是单峰的,而一般遥感图像都是包含多峰的密度,因此分类结果往往不够精确。用于模式分类的非参数方法正是解决这类问题的一个重要途径,可以从本质上克服这一缺陷,而且可以发现任意形状的聚类。均值漂移方法是基于密度估计的非参数聚类方法,遥感图像的聚类分析可以通过均值漂移方法来实现,而且均值漂移过程不需要预先给出地物的类别数目,在聚类过程中自动确定类别数,这对于图像中类别数目不易确定的情况,给非监督遥感图像聚类带来方便。     

加强企业统计工作的思考

企业统计是生产经营成果化、数量化的数字表现，是经济社会各项主要统计指标的源头数据之一。因此强化企业统计，加快统计信息网络建设，提高综合统计人员的素质，对企业的经营、对政府的宏观调控有着重要意义。     

Omnibus Hypothesis Testing in Dominance-Based Ordinal Multiple Regression.

Often quantitative data in the social sciences have only ordinal justification. Problems of interpretation can arise when least squares multiple regression (LSMR) is used with ordinal data. Two ordinal alternatives are discussed, dominance-based ordinal multiple regression (DOMR) and proportional odds multiple regression. The Q2 statistic is introduced for testing the omnibus null hypothesis in DOMR. A simulation study is discussed that examines the actual Type I error rate and power of Q2 in comparison to the LSMR omnibus F test under normality and non-normality. Results suggest that Q2 has favorable sampling properties as long as the sample size-to-predictors ratio is not too small, and Q2 can be a good alternative to the omnibus F test when the response variable is non-normal. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Probability Hazard Analysis of the Operation of Pipeline Systems,Tanks, and Pressure Vessels. Part 2. Method for the Evaluation of the Functional Fitness of a Structural Element According to the Restricted Statistical Data

We describe a procedure used for the evaluation of the engineering state of structures according to the “fitness-for-service” criterion based on the application of restricted amounts of statistical data, which can be obtained in the process of operation, testing, or numerical simulation. We propose a quasioptimal sequential statistical criterion capable of making decision concerning the functional fitness of objects with probability errors of the first and second kind that do not exceed specified values. The practical realization of the probability risk analysis of the operation of pipeline systems, reservoirs, and pressure vessel is performed in the form of a software methodical complex of the “Mitsnist’” expert system.__________Translated from Problemy Prochnosti, No. 3, pp. 96 – 103, May – June, 2005.     

工业企业生产法统计增加值的几个问题及对策

针对实际统计工作的现状，指出了当前我国工业企业生产法增加值统计核算中存在的指标口径差异、决算时间不统一、价格核算有差别、企业集团在增加值统计中的重最和遗漏问题等，并提出了对策和建议。     

Excel在数据分析中的应用

在进行科学试验和调查分析时,经常要处理大量的数据,有时还要对数据进行统计分析,或者对已有的数据进行拟合以获得未知的估计数据。数据的统计与分析已渗透到现代生活和科学技术的各个领域,本文给出了使用Excel进行简单数据分析的方法,并对回归分析给予了具体实例。     

动态系统预测的一种统计方法

给出了动态系统预测的一种统计方法及其递推估计公式，该方法充分利用了新信息，提高了预测准确度，减少了计算量，预测效果优于普通最小二乘估计.     

Conditional phase-type distributions for modelling patient length of stay in hospital

The proportion of elderly in the population is continuing to increase, placing additional demands on highly competitive medical budgets. The management of the care of the elderly within hospitals can be assisted by the accurate modelling of the length of stay of patients in hospital. This paper uses conditional phase‐type distributions for modelling the length of stay of a group of elderly patients in hospital. The model incorporates the use of Bayesian belief networks with Coxian phase‐type distributions, a special type of Markov model that describes the duration of stay in hospital as a process consisting of a sequence of latent phases. The incorporation of the Bayesian belief network in the model permits the inclusion of additional patient information which may provide a better understanding of the system, in particular the incorporation of any potential causal information that may exist in the data.     

On the probabilistic-deterministic transition involved in a fragmentation process of brittle materials

Dynamic loadings produce high stress waves leading to the fragmentation of brittle materials such as ceramics, concrete, glass and rocks. The main mechanism used to explain the change of the number of fragments with stress rate is a shielding phenomenon. However, under quasi-static loading conditions, a weakest link hypothesis may be applicable. Therefore, depending on the local strain or stress rate, different fragmentation regimes are observed. One regime corresponds to single fragmentation for which a probabilistic approach is needed. Conversely, the multiple fragmentation regime may be described by a deterministic approach. The transition between the two fragmentation regimes is discussed for high performance concrete, glass and SiC ceramics.     

On Advances in Statistical Modeling of Natural Images

Statistical analysis of images reveals two interesting properties: (i) invariance of image statistics to scaling of images, and (ii) non-Gaussian behavior of image statistics, i.e. high kurtosis, heavy tails, and sharp central cusps. In this paper we review some recent results in statistical modeling of natural images that attempt to explain these patterns. Two categories of results are considered: (i) studies of probability models of images or image decompositions (such as Fourier or wavelet decompositions), and (ii) discoveries of underlying image manifolds while restricting to natural images. Applications of these models in areas such as texture analysis, image classification, compression, and denoising are also considered.