全文获取类型
收费全文 | 4509篇 |
免费 | 114篇 |
国内免费 | 18篇 |
专业分类
管理学 | 229篇 |
民族学 | 8篇 |
人口学 | 55篇 |
丛书文集 | 52篇 |
理论方法论 | 32篇 |
综合类 | 623篇 |
社会学 | 64篇 |
统计学 | 3578篇 |
出版年
2024年 | 11篇 |
2023年 | 22篇 |
2022年 | 45篇 |
2021年 | 55篇 |
2020年 | 68篇 |
2019年 | 154篇 |
2018年 | 208篇 |
2017年 | 312篇 |
2016年 | 179篇 |
2015年 | 137篇 |
2014年 | 188篇 |
2013年 | 1209篇 |
2012年 | 346篇 |
2011年 | 149篇 |
2010年 | 138篇 |
2009年 | 152篇 |
2008年 | 159篇 |
2007年 | 117篇 |
2006年 | 95篇 |
2005年 | 112篇 |
2004年 | 103篇 |
2003年 | 74篇 |
2002年 | 68篇 |
2001年 | 60篇 |
2000年 | 70篇 |
1999年 | 60篇 |
1998年 | 73篇 |
1997年 | 46篇 |
1996年 | 18篇 |
1995年 | 28篇 |
1994年 | 45篇 |
1993年 | 22篇 |
1992年 | 23篇 |
1991年 | 9篇 |
1990年 | 10篇 |
1989年 | 8篇 |
1988年 | 9篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 9篇 |
1984年 | 6篇 |
1983年 | 7篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 6篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 6篇 |
1976年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有4641条查询结果,搜索用时 15 毫秒
991.
M. S. Srivastava 《统计学通讯:理论与方法》2013,42(4):775-792
In this paper, multivariate data with missing observations, where missing values could be by chance or by design, are considered for various models including the growth curve model. The likelihood equations are derived and the consistency of the estimates established. The likelihood ratio tests are explicity derived. 相似文献
992.
《统计学通讯:模拟与计算》2013,42(3):825-842
Abstract In this paper we study the predictor behaviour of the additive model. The prediction equation is introduced as well as the computational considerations to select the smoothing parameters through cross-validation. The additive predictor is compared with a partially linear predictor in a broad simulation study and an application to a real case, prediction of the atmospheric concentration of SO2 in sample stations. 相似文献
993.
《统计学通讯:理论与方法》2013,42(4):791-805
Abstract The inverse Gaussian (IG) family is now widely used for modeling non negative skewed measurements. In this article, we construct the likelihood-ratio tests (LRTs) for homogeneity of the order constrained IG means and study the null distributions for simple order and simple tree order cases. Interestingly, it is seen that the null distribution results for the normal case are applicable without modification to the IG case. This supplements the numerous well known and striking analogies between Gaussian and inverse Gaussian families 相似文献
994.
Jiin-Huarng Guo 《统计学通讯:理论与方法》2013,42(9):2069-2078
Some distribution-free methods are suggested in the paper for testing the hypothesis about the slope parameter in a one-sample linear regression model with multiple observations at each level of independent variable. Asymptotic relative efficiencies of these tests are discussed, and the tests are compared with their nonparametric competitors. 相似文献
995.
Alan T.K. Wan 《统计学通讯:理论与方法》2013,42(9):2079-2091
We derive and numerically evaluate the bias and mean square error of the inequality constrained least squares estimator in a model with two inequality constraints and multivariate terror terms. Our results suggest that qualitatively, the estimator properties found for models with normal errors carry over to the case of multivariate terrors. 相似文献
996.
Friedrich Pukelsheim 《Statistics》2013,47(3):323-331
The paper examplifies with Hsu’s model a general pattern as how to derive results of variance component estimation from well known results on mean estimation, as far as linear model theory is concerned. This ’ dispersion-mean-correspondence‘provides new and short proofs for various theorems from the literature, concerning unbiased invariant quadratic estimators with minimum BAYES risk or minimum variance. For pure variance component models, unbiased non-negative quadratic estimability is characterized in terms of the design matrices. 相似文献
997.
Asymptotic expansion of the nonnull distribution of the likelihood ratio statistic for testing muitisample sphericity in q multinormal populations is derived for the alternatives close to the null hypothesis. 相似文献
998.
A regression predictor is well-calibrated if the predictions it gives are equal to the average responses that would be observed in an independent sample. The usual least squares predictor does not have this property, but its calibration can be improved by shrinking the predictions by a factor which depends on the signal-to-noise ratio of the regression model. We suggest a semi-Bayesian approach to estimating this factor, giving an estimate closely related to the so-called Stein Shririkasre Factor. The results are illustrated on a large medical data set. 相似文献
999.
Hsiao-Hsian Gao 《Journal of applied statistics》2016,43(11):2019-2028
Smoothing methods for curve estimation have received considerable attention in statistics with a wide range of applications. However, to our knowledge, sample size planning for testing significance of curves has not been discussed in the literature. This paper focuses on sample size calculations for nonparametric regression and partially linear models based on local linear estimators. We describe explicit procedures for sample size calculations based on non- and semi-parametric F-tests. Data examples are provided to demonstrate the use of the procedures. 相似文献
1000.
Methods: Based on the index S (S = SENSITIVITY (SEN) × SPECIFICITY (SPE)), the new weighted product index Sw is defined as Sw = (SEN)2w × (SPE)2(1-w), where (0≤w≤1). The Sw is developed to be a new tool to select the optimal cut point in ROC analysis and be compared with the other two commonly used criteria.
Results: Comparing the optimal cut point for the three criteria, the wave range of the optimal cut point for the maximized weighted Youden index criterion is the widest, the weighted closest-to-(0,1) criterion is the narrowest and the weighted product index Sw criterion lays between the ranges of the two criteria. 相似文献