全文获取类型
收费全文 | 669篇 |
免费 | 7篇 |
国内免费 | 1篇 |
专业分类
管理学 | 44篇 |
民族学 | 2篇 |
人口学 | 4篇 |
丛书文集 | 22篇 |
理论方法论 | 19篇 |
综合类 | 187篇 |
社会学 | 4篇 |
统计学 | 395篇 |
出版年
2023年 | 1篇 |
2021年 | 1篇 |
2020年 | 6篇 |
2019年 | 19篇 |
2018年 | 30篇 |
2017年 | 41篇 |
2016年 | 9篇 |
2015年 | 6篇 |
2014年 | 23篇 |
2013年 | 157篇 |
2012年 | 29篇 |
2011年 | 21篇 |
2010年 | 25篇 |
2009年 | 21篇 |
2008年 | 25篇 |
2007年 | 19篇 |
2006年 | 19篇 |
2005年 | 16篇 |
2004年 | 22篇 |
2003年 | 11篇 |
2002年 | 17篇 |
2001年 | 20篇 |
2000年 | 18篇 |
1999年 | 19篇 |
1998年 | 11篇 |
1997年 | 13篇 |
1996年 | 12篇 |
1995年 | 7篇 |
1994年 | 9篇 |
1993年 | 9篇 |
1992年 | 8篇 |
1991年 | 4篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1981年 | 4篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 2篇 |
排序方式: 共有677条查询结果,搜索用时 15 毫秒
151.
This paper extends the concept of risk unbiasedness for applying to statistical prediction and nonstandard inference problems, by formalizing the idea that a risk unbiased predictor should be at least as close to the “true” predictant as to any “wrong” predictant, on the average. A novel aspect of our approach is measuring closeness between a predicted value and the predictant by a regret function, derived suitably from the given loss function. The general concept is more relevant than mean unbiasedness, especially for asymmetric loss functions. For squared error loss, we present a method for deriving best (minimum risk) risk unbiased predictors when the regression function is linear in a function of the parameters. We derive a Rao–Blackwell type result for a class of loss functions that includes squared error and LINEX losses as special cases. For location-scale families, we prove that if a unique best risk unbiased predictor exists, then it is equivariant. The concepts and results are illustrated with several examples. One interesting finding is that in some problems a best unbiased predictor does not exist, but a best risk unbiased predictor can be obtained. Thus, risk unbiasedness can be a useful tool for selecting a predictor. 相似文献
152.
将具p-Laplace算子的边值问题转化成算子方程,对于p的不同取值给出适当的条件.利用Mawhin连续引理的推广形式,证明了一类具p-Laplace算子的微分方程边值问题解的存在性,得到了一系列解存在的充分条件. 相似文献
153.
《统计学通讯:理论与方法》2012,41(24):5969-5984
AbstractIn this article, we consider non parametric range-based estimation procedure for diffusion processes and propose a instantaneous volatility estimator. Under some weak conditions, we certify that the proposed estimator has convergence in probability. Adding some necessary conditions, we prove a central limit theorem. By inference, we reach a conclusion that, with high frequency data in hand, the proposed estimator is more precise than those pure realized instantaneous volatility ones. Numerical simulation illustrates the finite sample properties of the proposed estimator. 相似文献
154.
《统计学通讯:理论与方法》2012,41(13-14):2283-2296
In the study of the inhibition of enzyme reactions the Michaelis–Menten model is extended to include two experimental variables and three or more parameters. We combine the three-parameter models for competitive and non competitive inhibition in a four-parameter model and use optimum design theory to find D- and Ds-optimum designs for discriminating between the models. These designs are compared with compound T-optimum designs which provide the most powerful tests for discrimination between models. A single design is found with high discrimination efficiency whichever model is true. 相似文献
155.
In the dynamic financial market, the change of financial asset prices is always described as a certain random events which result in abrupt changes. The random time when the event occurs is called a change point. As the event happens, in order to mitigate property damage the government should increase the macro-control ability. As a result, we need to find a valid statistical model for change point problem to solve it effectively. This paper proposes a semiparametric model for detecting the change points. According to the research of empirical studies and hypothesis testing we acquire the maximum likelihood estimators of change points. We use the loglikelihood ratio to test the multiple change points. We obtain some asymptotic results. The estimated change point is more efficient than the non parametric one through simulation experiments. Real data application illustrates the usage of the model. 相似文献
156.
王伯年 《上海理工大学学报(社会科学版)》1998,(1):26-29
在数学上将客观定律用量的分量形式表达为对坐标系具有不变性的方程,是张量分析所要解决的核心问题,为此,需从单一一的基矢量组发展为对偶的两个基矢量组,文中给地偶基几何意义解释的新证明,进一步阐明了“同变”与“逆变”的含义,说明“同变”较为现在广泛使用的 相似文献
157.
M. Gharib 《Australian & New Zealand Journal of Statistics》1998,40(1):95-102
This paper obtains some estimates for the rate of convergence in the multi-dimensional central limit theorem for vector-valued functions of a homogeneous Markov chain without assuming the finiteness of their absolute third moment. These estimates have a universal character and generalize the results that hold when the third moments are finite. 相似文献
158.
Jun Shao 《统计学通讯:理论与方法》2013,42(9):3017-3028
Let σ2 be the asymptotic variance of the sample p-quantile (0<p<1). Consistency of the delete-d jackknife estimators of σ2 with d being a fraction of n is proved under very weak conditions. Some other results, such as the asymptotic orders of the moments of the jackknife histograms and an analog of the generalized Helly's theorem, are also established. 相似文献
159.
James C. Spall 《统计学通讯:理论与方法》2013,42(7):1719-1730
A methodology is presented for gaining insight into properties — such as outlier influence, bias, and width of confidence intervals — of maximum likelihood estimates from nonidentically distributed Gaussian data. The methodology is based on an application of the implicit function theorem to derive an approximation to the maximum likelihood estimator. This approximation, unlike the maximum likelihood estimator, is expressed in closed form and thus it can be used in lieu of costly Monte Carlo simulation to study the properties of the maximum likelihood estimator. 相似文献
160.