全文获取类型
收费全文 | 3496篇 |
免费 | 123篇 |
国内免费 | 41篇 |
专业分类
管理学 | 324篇 |
民族学 | 15篇 |
人口学 | 53篇 |
丛书文集 | 246篇 |
理论方法论 | 69篇 |
综合类 | 1617篇 |
社会学 | 136篇 |
统计学 | 1200篇 |
出版年
2024年 | 3篇 |
2023年 | 22篇 |
2022年 | 39篇 |
2021年 | 42篇 |
2020年 | 55篇 |
2019年 | 85篇 |
2018年 | 111篇 |
2017年 | 118篇 |
2016年 | 114篇 |
2015年 | 96篇 |
2014年 | 174篇 |
2013年 | 492篇 |
2012年 | 264篇 |
2011年 | 199篇 |
2010年 | 193篇 |
2009年 | 141篇 |
2008年 | 171篇 |
2007年 | 216篇 |
2006年 | 172篇 |
2005年 | 155篇 |
2004年 | 173篇 |
2003年 | 177篇 |
2002年 | 115篇 |
2001年 | 83篇 |
2000年 | 64篇 |
1999年 | 40篇 |
1998年 | 25篇 |
1997年 | 26篇 |
1996年 | 12篇 |
1995年 | 18篇 |
1994年 | 11篇 |
1993年 | 9篇 |
1992年 | 16篇 |
1991年 | 5篇 |
1990年 | 5篇 |
1989年 | 6篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1977年 | 1篇 |
排序方式: 共有3660条查询结果,搜索用时 14 毫秒
91.
With the rapid development of e-commerce, online consumer review plays an increasingly important role in consumers’ purchase decisions. Most research papers use the quantitative measures of consumer reviews for statistical analysis. Here we focus on analyzing the texts of customer reviews with text mining tools. We propose a new feature selection method called maximizing the difference. Various classification methods such as boosting, random forest and SVM are used to test the performance of the new method along with different evaluation criteria. Both simulation and empirical results show that it improves the effectiveness of the classifier over the existing methods. 相似文献
92.
Motivated by the need to analyze the National Longitudinal Surveys data, we propose a new semiparametric longitudinal mean‐covariance model in which the effects on dependent variable of some explanatory variables are linear and others are non‐linear, while the within‐subject correlations are modelled by a non‐stationary autoregressive error structure. We develop an estimation machinery based on least squares technique by approximating non‐parametric functions via B‐spline expansions and establish the asymptotic normality of parametric estimators as well as the rate of convergence for the non‐parametric estimators. We further advocate a new model selection strategy in the varying‐coefficient model framework, for distinguishing whether a component is significant and subsequently whether it is linear or non‐linear. Besides, the proposed method can also be employed for identifying the true order of lagged terms consistently. Monte Carlo studies are conducted to examine the finite sample performance of our approach, and an application of real data is also illustrated. 相似文献
93.
《Journal of Statistical Computation and Simulation》2012,82(6):489-502
The Wisconsin Epidemiologic Study of Diabetic Retinopathy is a population-based epidemiological study carried out in Southern Wisconsin during the 1980s. The resulting data were analysed by different statisticians and ophthalmologists during the last two decades. Most of the analyses were carried out on the baseline data, although there were two follow-up studies on the same population. A Bayesian analysis of the first follow-up data, taken four years after the baseline study, was carried out by Angers and Biswas [Angers, J.-F. and Biswas, A., 2004, A Bayesian analysis of the four-year follow-up data of theWisconsin epidemiologic study of diabetic retinopathy. Statistics in Medicine, 23, 601–615.], where the choice of the best model in terms of the covariate inclusion is done, and estimates of the associated covariate effects were obtained using the baseline data to set the prior for the parameters. In the present article we consider an univariate transformation of the bivariate ordinal data, and a parallel analysis with the much simpler univariate data is carried out. The results are then compared with the results of Angers and Biswas (2004). In conclusion, our analyses suggest that the univariate analysis fails to detect features of the data found by the bivariate analysis. Even an univariate transformation of our data with quite high correlation with both left and right eyes is inadequate. 相似文献
94.
A supersaturated design (SSD) is a design whose run size is not enough for estimating all main effects. Such a design is commonly used in screening experiments to screen active effects based on the effect sparsity principle. Traditional approaches, such as the ordinary stepwise regression and the best subset variable selection, may not be appropriate in this situation. In this article, a new variable selection method is proposed based on the idea of staged dimensionality reduction. Simulations and several real data studies indicate that the newly proposed method is more effective than the existing data analysis methods. 相似文献
95.
我们党选用干部标准的思想经历了从毛泽东提出的"德才兼备"到胡锦涛明确提出的"德才兼备、以德为先"的历史的、理论的发展演变过程。从宏观上和战略上看,坚持"以德为先"选用干部,在理论层面和现实需求层面上都具有重大的价值意义。要使"以德为先"用人标准不致于流于形式,就必须健全完善与时俱进的党员干部"德"之衡量标准。 相似文献
96.
墓志的性质在宋代由哀悼文学转向传记文学,更多地记载墓主个人的事迹。本文通过墓志资料考察宋代士人家庭的择偶行为,进一步了解长辈为子女择偶的状况以及当时社会流行的择偶价值观。 相似文献
97.
M.S. Srivastava 《统计学通讯:理论与方法》2013,42(11):3285-3299
In this paper, the bootstrap method of Efron (1979) is given for a ranking and a slippage problem, where the ranking (or slippage) is with respect to the mean of the distributions. The method is also applied to obtain a confidence interval for the largest mean. 相似文献
98.
This paper deals with the problem of selecting the “best” population from a given number of populations in a decision theoretic framework. The class of selection rules considered is based on a suitable partition of the sample space. A selection rule is given which is shown to have certain optimum properties among the selection rules in the given class for a mal rules are known. 相似文献
99.
Youngjae Chang 《统计学通讯:模拟与计算》2013,42(8):1703-1726
Many tree algorithms have been developed for regression problems. Although they are regarded as good algorithms, most of them suffer from loss of prediction accuracy when there are many irrelevant variables and the number of predictors exceeds the number of observations. We propose the multistep regression tree with adaptive variable selection to handle this problem. The variable selection step and the fitting step comprise the multistep method. The multistep generalized unbiased interaction detection and estimation (GUIDE) with adaptive forward selection (fg) algorithm, as a variable selection tool, performs better than some of the well-known variable selection algorithms such as efficacy adaptive regression tube hunting (EARTH), FSR (false selection rate), LSCV (least squares cross-validation), and LASSO (least absolute shrinkage and selection operator) for the regression problem. The results based on simulation study show that fg outperforms other algorithms in terms of selection result and computation time. It generally selects the important variables correctly with relatively few irrelevant variables, which gives good prediction accuracy with less computation time. 相似文献
100.
Qinghua Ji 《统计学通讯:理论与方法》2020,49(7):1537-1560
AbstractIn this article, we propose a penalized local log-likelihood method to locally select the number of components in non parametric finite mixture of regression models via proportion shrinkage method. Mean functions and variance functions are estimated simultaneously. We show that the number of components can be estimated consistently, and further establish asymptotic normality of functional estimates. We use a modified EM algorithm to estimate the unknown functions. Simulations are conducted to demonstrate the performance of the proposed method. We illustrate our method via an empirical analysis of the housing price index data of United States. 相似文献