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291.
关于加强河北省高校教师队伍建设的思考 总被引:5,自引:0,他引:5
侯建国 《河北科技大学学报(社会科学版)》2007,7(3):87-91
"十五"期间河北省高校教师队伍建设取得了很大成绩,但与发达省市相比仍有一定差距,不能满足建设沿海经济社会发展强省的需要。本文从加强教师职业道德建设、实施"高层次创造性人才工程"、优化教师资源配置、强化教师培训、深化高校人事分配制度改革等五个方面提出了加强河北省高校教师队伍建设的对策和建议。 相似文献
292.
Under the hypothesis of white noise, the authors derive the explicit form of the asymptotic representation of linear rank statistics resulting from Hájek's (1968) celebrated projection lemma for linear rank statistics in the so‐called approximate score case. This representation based on Bernstein polynomials is better, in the quadratic mean sense, than the traditional one due to Hájek (1961, 1962). The polynomial representation allows for a new derivation of classical asymptotic results (asymptotic normality, Berry‐Essten bounds). Moreover, a simulation study shows that the quality of the polynomial approximation to the exact finite‐sample distributions of rank statistics is sizeably better than that resulting from the traditional approach. 相似文献
293.
Gareth M. James & Trevor J. Hastie 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2001,63(3):533-550
We introduce a technique for extending the classical method of linear discriminant analysis (LDA) to data sets where the predictor variables are curves or functions. This procedure, which we call functional linear discriminant analysis ( FLDA ), is particularly useful when only fragments of the curves are observed. All the techniques associated with LDA can be extended for use with FLDA. In particular FLDA can be used to produce classifications on new (test) curves, give an estimate of the discriminant function between classes and provide a one- or two-dimensional pictorial representation of a set of curves. We also extend this procedure to provide generalizations of quadratic and regularized discriminant analysis. 相似文献
295.
Giuseppe Cavaliere Luca Fanelli Paolo Paruolo 《Statistical Methods and Applications》2009,18(2):169-191
This paper discusses likelihood-ratio (LR) tests on the cointegrating (CI) rank which consider any possible dimension of the
CI rank under the alternative. The trace test and lambda-max test are obtained as special cases. Limit quantiles for all the
tests in the class are derived. It is found that any of these tests can be used to construct an estimator of the CI rank, with no differences in asymptotic properties when the
alternative is fixed. The properties of the class of tests are investigated by local asymptotic analysis, a simulation study
and an empirical illustration. It is found that all the tests in the class have comparable power, which deteriorates substantially
as the number of random walks increases. Tests constructed for a specific class of alternatives present minor power gains
for alternatives in the class, and require the alternative to be far from the null. No test in this class is found to be asymptotically
(in-)admissible. Some of the new tests in the class can also be arranged to give a constrained estimator of the CI rank, that restricts the minimum number of common trends. The power gains that these tests can obtain
by constraining the minimum number of common trends appears to be limited and outweighted by the risk of inconsistency induced
by the constrains. As a consequence, no value of the CI rank should be left untested, unless it can be excluded beyond any
reasonable doubt. 相似文献
296.
Suppose p + 1 experimental groups correspond to increasing dose levels of a treatment and all groups are subject to right censoring. In such instances, permutation tests for trend can be performed based on statistics derived from the weighted log‐rank class. This article uses saddlepoint methods to determine the mid‐P‐values for such permutation tests for any test statistic in the weighted log‐rank class. Permutation simulations are replaced by analytical saddlepoint computations which provide extremely accurate mid‐P‐values that are exact for most practical purposes and almost always more accurate than normal approximations. The speed of mid‐P‐value computation allows for the inversion of such tests to determine confidence intervals for the percentage increase in mean (or median) survival time per unit increase in dosage. The Canadian Journal of Statistics 37: 5‐16; 2009 © 2009 Statistical Society of Canada 相似文献
297.
唐代宗室可由爵位出官,亦可由血缘关系出官。以爵位出官,《旧唐书》、《新唐书》的记载清晰准确,《唐六典》与《唐会要》的记述则比较模糊。以爵出官的品阶也与实际情况有所差距。若以血缘关系出官,宗室的五等血缘品阶与其出官品阶并不一一对应。唐代的宗室政策,在高祖时延续隋制,从太宗开始,保持近房宗室的政治地位,压制远房宗室。玄宗以后,近房宗室基本不出阁,远房宗室则与异姓之臣杂而仕宦。在对政局的影响上,唐代宗室整体素质较低,影响是消极的。 相似文献
298.
面对金融市场的大量不确定性因素,如何合理选择有效的定价因子并构建科学的资产定价体系,一直是金融理论研究的核心问题之一。本文利用图嵌入的方法,基于稀疏表示和低秩表示策略,深度挖掘潜含在数据集中的内在结构,构建了能够同时揭示数据局部结构信息和全局结构信息的集成学习策略,以实现不同维度的多源数据融合。从CAPM和APT理论出发,通过集成预测的方法构建量化多因子资产选择模型,代表性地选择了卷积神经网络、梯度提升决策树、时间序列及支持向量机等模型进行单一预测,并通过稀疏低秩的图近似最小二乘回归集成策略进行优化。实证结果表明基于集成预测的稀疏低秩策略其资产选择能力更强,超额收益率更高。采用机器学习的非线性预测方法更有利于揭示金融系统的复杂特性。实证结论对投资组合管理具有重要指导意义。 相似文献
299.
Casey M. Jelsema Richard K. Kwok Shyamal D. Peddada 《Journal of Statistical Computation and Simulation》2019,89(11):2121-2137
Large spatial datasets are typically modelled through a small set of knot locations; often these locations are specified by the investigator by arbitrary criteria. Existing methods of estimating the locations of knots assume their number is known a priori, or are otherwise computationally intensive. We develop a computationally efficient method of estimating both the location and number of knots for spatial mixed effects models. Our proposed algorithm, Threshold Knot Selection (TKS), estimates knot locations by identifying clusters of large residuals and placing a knot in the centroid of those clusters. We conduct a simulation study showing TKS in relation to several comparable methods of estimating knot locations. Our case study utilizes data of particulate matter concentrations collected during the course of the response and clean-up effort from the 2010 Deepwater Horizon oil spill in the Gulf of Mexico. 相似文献
300.
A challenge arising in cancer immunotherapy trial design is the presence of a delayed treatment effect wherein the proportional hazard assumption no longer holds true. As a result, a traditional survival trial design based on the standard log‐rank test, which ignores the delayed treatment effect, will lead to substantial loss of statistical power. Recently, a piecewise weighted log‐rank test is proposed to incorporate the delayed treatment effect into consideration of the trial design. However, because the sample size formula was derived under a sequence of local alternative hypotheses, it results in an underestimated sample size when the hazard ratio is relatively small for a balanced trial design and an inaccurate sample size estimation for an unbalanced design. In this article, we derived a new sample size formula under a fixed alternative hypothesis for the delayed treatment effect model. Simulation results show that the new formula provides accurate sample size estimation for both balanced and unbalanced designs. 相似文献