全文获取类型
收费全文 | 5200篇 |
免费 | 122篇 |
国内免费 | 14篇 |
专业分类
管理学 | 274篇 |
民族学 | 3篇 |
人口学 | 49篇 |
丛书文集 | 62篇 |
理论方法论 | 26篇 |
综合类 | 835篇 |
社会学 | 45篇 |
统计学 | 4042篇 |
出版年
2024年 | 1篇 |
2023年 | 25篇 |
2022年 | 35篇 |
2021年 | 32篇 |
2020年 | 84篇 |
2019年 | 173篇 |
2018年 | 192篇 |
2017年 | 329篇 |
2016年 | 147篇 |
2015年 | 108篇 |
2014年 | 154篇 |
2013年 | 1471篇 |
2012年 | 409篇 |
2011年 | 135篇 |
2010年 | 143篇 |
2009年 | 181篇 |
2008年 | 173篇 |
2007年 | 127篇 |
2006年 | 126篇 |
2005年 | 134篇 |
2004年 | 111篇 |
2003年 | 87篇 |
2002年 | 85篇 |
2001年 | 86篇 |
2000年 | 94篇 |
1999年 | 102篇 |
1998年 | 80篇 |
1997年 | 70篇 |
1996年 | 65篇 |
1995年 | 55篇 |
1994年 | 54篇 |
1993年 | 30篇 |
1992年 | 43篇 |
1991年 | 12篇 |
1990年 | 33篇 |
1989年 | 17篇 |
1988年 | 29篇 |
1987年 | 9篇 |
1986年 | 6篇 |
1985年 | 10篇 |
1984年 | 17篇 |
1983年 | 17篇 |
1982年 | 11篇 |
1981年 | 8篇 |
1980年 | 2篇 |
1979年 | 8篇 |
1978年 | 7篇 |
1977年 | 3篇 |
1975年 | 5篇 |
1973年 | 1篇 |
排序方式: 共有5336条查询结果,搜索用时 968 毫秒
281.
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
282.
In this study, we investigate linear regression having both heteroskedasticity and collinearity problems. We discuss the properties related to the perturbation method. Important observations are summarized as theorems. We then prove the main result that states the heteroskedasticity-robust variances can be improved and that the resulting bias is minimized by using the matrix perturbation method. We analyze a practical example for validation of the method. 相似文献
283.
284.
We introduce a new family of distributions suitable for fitting positive data sets with high kurtosis which is called the Slashed Generalized Rayleigh Distribution. This distribution arises as the quotient of two independent random variables, one being a generalized Rayleigh distribution in the numerator and the other a power of the uniform distribution in the denominator. We present properties and carry out estimation of the model parameters by moment and maximum likelihood (ML) methods. Finally, we conduct a small simulation study to evaluate the performance of ML estimators and analyze real data sets to illustrate the usefulness of the new model. 相似文献
285.
286.
Sherzod B. Akhundjanov 《统计学通讯:理论与方法》2017,46(10):4977-5000
In this article, we study exponentially weighted moving average (EWMA) control schemes to monitor the multivariate Poisson distribution with a general covariance structure, so that the practitioner can simultaneously monitor multiple correlated attribute processes more effectively. The statistical performance of the charts is assessed in terms of the run length properties and compared against other mainstream attribute control schemes. The application of the proposed methods to real-life and simulated datasets is demonstrated. 相似文献
287.
In this paper, the researchers attempt to introduce a new generalization of the Weibull-geometric distribution. The failure rate function of the new model is found to be increasing, decreasing, upside-down bathtub, and bathtub-shaped. The researchers obtained the new model by compounding Weibull distribution and discrete generalized exponential distribution of a second type, which is a generalization of the geometric distribution. The new introduced model contains some previously known lifetime distributions as well as a new one. Some basic distributional properties and moments of the new model are discussed. Estimation of the parameters is illustrated and the model with two known real data sets is examined. 相似文献
288.
Soner Coban Omer Gokhan Doluoglu Ibrahim Keles Hakan Demirci Ali Riza Turkoglu Muhammet Guzelsoy 《The aging male》2016,19(2):124-127
Objectives: To investigate the predictive values of free prostate-specific antigen (fPSA), total PSA (tPSA) and age on the prostate volume.Methods: The data of 2148 patients with lower urinary tract symptoms were analyzed retrospectively. The patients who had transrectal ultrasonography guided 10 core biopsies owing to the findings obtained on digital rectal examination and presence of high PSA levels (PSA?=?2.5–10?ng/dl), and proven to have BPH histopathologically were included in the study. Age, tPSA, fPSA and the prostate volumes (PV) of the patients were noted.Results: One thousand patients that fulfilled the inclusion criteria were included in the study. The PV of the patients were significantly correlated with age, tPSA and fPSA (p?0.001 and r?=?0.307, p?0.001 and r?=?0.382, p?0.001 and r?=?0.296, respectively). On linear regression model, fPSA was found as a stronger predictive for PV (AUC?=?0.75, p?0.001) when compared to age (AUC?=?0.64, p?0.001), and tPSA (AUC?=?0.69, p?=?0.013).Conclusions: Although tPSA is an important prognostic factor for predicting PV, the predictive value of fPSA is higher. PV can easily be predicted by using age, and serum tPSA and fPSA levels. 相似文献
289.
公正价值作为政治价值范畴与社会价值范畴的交叉内容,构成新闻舆论引导的具体内涵之一。为避免一种公正价值主张的舆论对其他的公正价值产生抵牾,新闻从业者对公正价值观的丰富内涵应有准确把握与完整解读,善于以新闻事件为载体,理性倡导、型塑"适度的爱"与"最低限度的爱"、"获益条件与机会均等"、"所得待遇合乎其所享有权利"、"得其应得"与"先天条件最少者受惠"的公正价值舆论。 相似文献
290.
We propose an efficient and robust method for variance function estimation in semiparametric longitudinal data analysis. The method utilizes a local log‐linear approximation for the variance function and adopts a generalized estimating equation approach to account for within subject correlations. We show theoretically and empirically that our method outperforms estimators using working independence that ignores the correlations. The Canadian Journal of Statistics 39: 656–670; 2011. © 2011 Statistical Society of Canada 相似文献