全文获取类型
收费全文 | 20354篇 |
免费 | 651篇 |
国内免费 | 1篇 |
专业分类
管理学 | 2652篇 |
民族学 | 116篇 |
人口学 | 1802篇 |
丛书文集 | 78篇 |
教育普及 | 1篇 |
理论方法论 | 1877篇 |
综合类 | 192篇 |
社会学 | 10492篇 |
统计学 | 3796篇 |
出版年
2023年 | 148篇 |
2022年 | 86篇 |
2021年 | 144篇 |
2020年 | 367篇 |
2019年 | 551篇 |
2018年 | 651篇 |
2017年 | 850篇 |
2016年 | 652篇 |
2015年 | 434篇 |
2014年 | 605篇 |
2013年 | 3671篇 |
2012年 | 768篇 |
2011年 | 723篇 |
2010年 | 528篇 |
2009年 | 430篇 |
2008年 | 566篇 |
2007年 | 510篇 |
2006年 | 554篇 |
2005年 | 445篇 |
2004年 | 451篇 |
2003年 | 376篇 |
2002年 | 397篇 |
2001年 | 483篇 |
2000年 | 425篇 |
1999年 | 415篇 |
1998年 | 319篇 |
1997年 | 271篇 |
1996年 | 285篇 |
1995年 | 292篇 |
1994年 | 248篇 |
1993年 | 261篇 |
1992年 | 299篇 |
1991年 | 296篇 |
1990年 | 292篇 |
1989年 | 257篇 |
1988年 | 239篇 |
1987年 | 203篇 |
1986年 | 230篇 |
1985年 | 249篇 |
1984年 | 218篇 |
1983年 | 193篇 |
1982年 | 159篇 |
1981年 | 131篇 |
1980年 | 155篇 |
1979年 | 171篇 |
1978年 | 133篇 |
1977年 | 114篇 |
1976年 | 88篇 |
1975年 | 91篇 |
1974年 | 93篇 |
排序方式: 共有10000条查询结果,搜索用时 468 毫秒
941.
The kappa coefficient is a widely used measure for assessing agreement on a nominal scale. Weighted kappa is an extension of Cohen's kappa that is commonly used for measuring agreement on an ordinal scale. In this article, it is shown that weighted kappa can be computed as a function of unweighted kappas. The latter coefficients are kappa coefficients that correspond to smaller contingency tables that are obtained by merging categories. 相似文献
942.
In this article, the statistical inference for the Gompertz distribution based on Type-II progressively hybrid censored data is discussed. The estimation of the parameters for Gompertz distribution is obtained using maximum likelihood method (MLE) and Bayesian method under three different loss functions. We also proved the existence and uniqueness of the MLE. The one-sample Bayesian prediction intervals are obtained. The work is done for different values of the parameters. We apply the Monto Carlo simulation to compare the proposed methods, also an example is discussed to construct the Prediction intervals. 相似文献
943.
In this article, a new form of multivariate slash distribution is introduced and some statistical properties are derived. In order to illustrate the advantage of this distribution over the existing generalized multivariate slash distribution in the literature, it is applied to a real data set. 相似文献
944.
This article deals with the Bayesian and non Bayesian estimation of multicomponent stress–strength reliability by assuming the Kumaraswamy distribution. Both stress and strength are assumed to have a Kumaraswamy distribution with common and known shape parameter. The reliability of such a system is obtained by the methods of maximum likelihood and Bayesian approach and the results are compared using Markov Chain Monte Carlo (MCMC) technique for both small and large samples. Finally, two data sets are analyzed for illustrative purposes. 相似文献
945.
Robert M. Mnatsakanov 《统计学通讯:理论与方法》2017,46(7):3174-3185
Two approximations recovering the functions from their transformed moments are proposed. The upper bounds for the uniform rate of convergence are derived. In addition, the comparisons of the estimates of the cumulative distribution function and its density function with the empirical distribution and the kernel density estimates are conducted via a simulation study. The plots of recovered functions are presented for several examples as well. 相似文献
946.
In this paper, we introduce an extension of the generalized exponential (GE) distribution, making it more robust against possible influential observations. The new model is defined as the quotient between a GE random variable and a beta-distributed random variable with one unknown parameter. The resulting distribution is a distribution with greater kurtosis than the GE distribution. Probability properties of the distribution such as moments and asymmetry and kurtosis are studied. Likewise, statistical properties are investigated using the method of moments and the maximum likelihood approach. Two real data analyses are reported illustrating better performance of the new model over the GE model. 相似文献
947.
S. M. R. Alavi 《统计学通讯:理论与方法》2017,46(5):2193-2201
948.
A new two-parameter distribution, the gamma-Maxwell distribution, isproposed and studied. We generate the new distribution using the gamma-G generator of distributions. The proposal distribution can be seen as an extension of the Maxwell distribution with more flexibility in terms of the distribution asymmetry and kurtosis. We study some probability properties, discuss maximum-likelihood estimation and present a real data application indicating that the new distribution can improve the ordinary Maxwell distribution in fitting real data. 相似文献
949.
This qualitative study focuses on the different ways time is experienced by children in families who face time challenges because of a family member's job that required work travel. Data are from a family‐level study that includes interviews of all family members older than age 7. Using grounded theory methodology, this study illustrates the ways in which job demands and family processes interact. The analysis centers on 75 children's perspectives from 43 families. Holding together assessments of having enough time while wanting more time with their parents, children express emotion, generally unrecognized by parents, around the topic of family time. Children's experience of time with parents is rushed or calm, depending on the activities done in time and the gender of the parent with whom they spend time. Findings are interpreted through a feminist social constructionist lens. 相似文献
950.
Bisexual youth are at elevated risk for depression when compared with lesbians and gay men. Research on bisexual stigma suggests that these youth are uniquely vulnerable to stress related to sexual identity disclosure. Depression associated with this stress may be buffered by social support from parents and friends. We examined the differential influence of social support from parents and friends (Child and Adolescent Social Support Scale) on the relation between disclosure stress (LGBTQ Coming Out Stress Scale) and depressive symptoms (Beck Depression Inventory) and differences by gender in a sample of cisgender bisexual youth (N = 383) using structural equation modeling. Parental support buffered the association between stressful disclosure to family and depressive symptoms, especially for bisexual men; bisexual women seemed not to benefit from such support when disclosure stress was high. This nuanced examination elucidates the ways family members and clinicians can best support bisexual youth sexual identity disclosure. 相似文献