全文获取类型
收费全文 | 2399篇 |
免费 | 80篇 |
国内免费 | 19篇 |
专业分类
管理学 | 182篇 |
民族学 | 14篇 |
人口学 | 12篇 |
丛书文集 | 215篇 |
理论方法论 | 91篇 |
综合类 | 1147篇 |
社会学 | 61篇 |
统计学 | 776篇 |
出版年
2024年 | 2篇 |
2023年 | 7篇 |
2022年 | 17篇 |
2021年 | 23篇 |
2020年 | 38篇 |
2019年 | 37篇 |
2018年 | 57篇 |
2017年 | 106篇 |
2016年 | 61篇 |
2015年 | 71篇 |
2014年 | 105篇 |
2013年 | 405篇 |
2012年 | 151篇 |
2011年 | 123篇 |
2010年 | 111篇 |
2009年 | 111篇 |
2008年 | 123篇 |
2007年 | 118篇 |
2006年 | 122篇 |
2005年 | 143篇 |
2004年 | 114篇 |
2003年 | 94篇 |
2002年 | 84篇 |
2001年 | 73篇 |
2000年 | 60篇 |
1999年 | 30篇 |
1998年 | 14篇 |
1997年 | 12篇 |
1996年 | 16篇 |
1995年 | 6篇 |
1994年 | 6篇 |
1993年 | 14篇 |
1992年 | 9篇 |
1991年 | 3篇 |
1990年 | 6篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1980年 | 1篇 |
1978年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有2498条查询结果,搜索用时 156 毫秒
71.
Hanzhou Pang 《Social Identities》2016,22(6):577-589
This study explores the ideological contentions about peace behind the contrasting projections of Mao Zedong’s images, especially his standard portraits, and photos of him and Western leaders (including those of the Soviet Union directly or indirectly). The analyses focus on the complicated spectatorship of Mao Zedong’s images in the international activisms that were intended to change the political power structure of the world. This involves the contradictory visualisations from both the socialist and capitalist ideologies. From Nixon’s visits to Mao Zedong and Gorbachev’s visit to the Portrait of Mao Zedong in the 1989 student movement, the concepts of nationalism and internationalism, new world order, and Mao Zedong’s theories of contradiction and three worlds are examined to better understand the visual realities of ‘peaceful evolution’. 相似文献
72.
《Journal of Statistical Computation and Simulation》2012,82(8):985-999
Comparisons of best linear unbiased estimators with some other prominent estimators have been carried out over the last 50 years since the ground breaking work of Lloyd [E.H. Lloyd, Least squares estimation of location and scale parameters using order statistics, Biometrika 39 (1952), pp. 88–95]. These comparisons have been made under many different criteria across different parametric families of distributions. A noteworthy one is by Nagaraja [H.N. Nagaraja, Comparison of estimators and predictors from two-parameter exponential distribution, Sankhyā Ser. B 48 (1986), pp. 10–18], who made a comparison of best linear unbiased (BLUE) and best linear invariant (BLIE) estimators in the case of exponential distribution. In this paper, continuing along the same lines by assuming a Type II right censored sample from a scaled-exponential distribution, we first compare BLUE and BLIE of the exponential mean parameter in terms of Pitman closeness (nearness) criterion. We show that the BLUE is always Pitman closer than the BLIE. Next, we introduce the notions of Pitman monotonicity and Pitman consistency, and then establish that both BLUE and BLIE possess these two properties. 相似文献
73.
74.
In this paper, the two-parameter Pareto distribution is considered and the problem of prediction of order statistics from a future sample and that of its geometric mean are discussed. The Bayesian approach is applied to construct predictors based on observed k-record values for the cases when the future sample size is fixed and when it is random. Several Bayesian prediction intervals are derived. Finally, the results of a simulation study and a numerical example are presented for illustrating all the inferential procedures developed here. 相似文献
75.
Outer product of gradients (OPG) achieves dimension reduction via estimating the gradients of the regression function. In this paper, we propose two novel OPG estimators via local rank regression: the rank OPG estimator and the Walsh-average OPG estimator. Both proposals guard against a wide range of error distributions, and are safe alternatives to existing OPG estimators based on local linear regression or local L1 regression. The effectiveness of the new proposals are demonstrated via extensive numerical studies. 相似文献
76.
Luis Firinguetti 《统计学通讯:模拟与计算》2013,42(2-3):689-714
The exact properties of the Lawless and Wang Operational Ridge Regression estimator are derived in the context of a misspecified regression equation. 相似文献
77.
K. Jayakumar 《统计学通讯:模拟与计算》2013,42(10):3092-3117
AbstractWe introduce a new family of distributions using truncated discrete Linnik distribution. This family is a rich family of distributions which includes many important families of distributions such as Marshall–Olkin family of distributions, family of distributions generated through truncated negative binomial distribution, family of distributions generated through truncated discrete Mittag–Leffler distribution etc. Some properties of the new family of distributions are derived. A particular case of the family, a five parameter generalization of Weibull distribution, namely discrete Linnik Weibull distribution is given special attention. This distribution is a generalization of many distributions, such as extended exponentiated Weibull, exponentiated Weibull, Weibull truncated negative binomial, generalized exponential truncated negative binomial, Marshall-Olkin extended Weibull, Marshall–Olkin generalized exponential, exponential truncated negative binomial, Marshall–Olkin exponential and generalized exponential. The shape properties, moments, median, distribution of order statistics, stochastic ordering and stress–strength properties of the new generalized Weibull distribution are derived. The unknown parameters of the distribution are estimated using maximum likelihood method. The discrete Linnik Weibull distribution is fitted to a survival time data set and it is shown that the distribution is more appropriate than other competitive models. 相似文献
78.
This paper considers the maximum and minimum of a pair of log-normal variables with equal mean. It shows that either order statistic has a smaller coefficient of variation than the two original log-normal variables provided the latter are of equal variance. When the variances are unequal, as the variance ratio increases, the minimum (maximum), has a smaller coefficient of variation if the correlation coefficient of the log-normal variables is small (small) and the variances are large (small). 相似文献
79.
80.
Philipp Renner Karl Schmedders 《Econometrica : journal of the Econometric Society》2015,83(2):729-769
This paper presents a new method for the analysis of moral hazard principal–agent problems. The new approach avoids the stringent assumptions on the distribution of outcomes made by the classical first‐order approach and instead only requires the agent's expected utility to be a rational function of the action. This assumption allows for a reformulation of the agent's utility maximization problem as an equivalent system of equations and inequalities. This reformulation in turn transforms the principal's utility maximization problem into a nonlinear program. Under the additional assumptions that the principal's expected utility is a polynomial and the agent's expected utility is rational in the wage, the final nonlinear program can be solved to global optimality. The paper also shows how to first approximate expected utility functions that are not rational by polynomials, so that the polynomial optimization approach can be applied to compute an approximate solution to nonpolynomial problems. Finally, the paper demonstrates that the polynomial optimization approach extends to principal–agent models with multidimensional action sets. 相似文献