全文获取类型
收费全文 | 2925篇 |
免费 | 99篇 |
国内免费 | 1篇 |
专业分类
管理学 | 405篇 |
民族学 | 10篇 |
人口学 | 259篇 |
丛书文集 | 17篇 |
理论方法论 | 336篇 |
综合类 | 35篇 |
社会学 | 1203篇 |
统计学 | 760篇 |
出版年
2023年 | 19篇 |
2021年 | 18篇 |
2020年 | 52篇 |
2019年 | 73篇 |
2018年 | 99篇 |
2017年 | 119篇 |
2016年 | 69篇 |
2015年 | 74篇 |
2014年 | 89篇 |
2013年 | 601篇 |
2012年 | 120篇 |
2011年 | 102篇 |
2010年 | 74篇 |
2009年 | 61篇 |
2008年 | 78篇 |
2007年 | 74篇 |
2006年 | 64篇 |
2005年 | 56篇 |
2004年 | 44篇 |
2003年 | 26篇 |
2002年 | 47篇 |
2001年 | 57篇 |
2000年 | 56篇 |
1999年 | 47篇 |
1998年 | 38篇 |
1997年 | 38篇 |
1996年 | 31篇 |
1995年 | 36篇 |
1994年 | 41篇 |
1993年 | 35篇 |
1992年 | 47篇 |
1991年 | 47篇 |
1990年 | 34篇 |
1989年 | 33篇 |
1988年 | 43篇 |
1987年 | 19篇 |
1986年 | 26篇 |
1985年 | 38篇 |
1984年 | 30篇 |
1983年 | 40篇 |
1982年 | 26篇 |
1981年 | 23篇 |
1980年 | 22篇 |
1979年 | 23篇 |
1978年 | 40篇 |
1977年 | 20篇 |
1976年 | 26篇 |
1975年 | 24篇 |
1974年 | 15篇 |
1972年 | 14篇 |
排序方式: 共有3025条查询结果,搜索用时 15 毫秒
81.
Víctor Leiva Shuangzhe Liu Lei Shi Francisco José A. Cysneiros 《Journal of applied statistics》2016,43(4):627-642
We propose an influence diagnostic methodology for linear regression models with stochastic restrictions and errors following elliptically contoured distributions. We study how a perturbation may impact on the mixed estimation procedure of parameters in the model. Normal curvatures and slopes for assessing influence under usual schemes are derived, including perturbations of case-weight, response variable, and explanatory variable. Simulations are conducted to evaluate the performance of the proposed methodology. An example with real-world economy data is presented as an illustration. 相似文献
82.
This mixed methods study explored health care access problems faced by long-distance truck drivers. Thirty trucking professionals were interviewed at truck-stops in Michigan about health status and health care access. Thirty of the 88 drivers approached participated. The most common illnesses they reported concerned the eye, back, excessive stress at work and painful joints or arthritis. Most respondents had a family doctor; for those who did not, cost was a major contributing factor. More than one third stated their health is "not excellent" because of poor accessibility to healthcare on the road. Almost unanimously, drivers desired to have access to health care clinics in truck-stop areas and described particular access problems; the solution may be as simple as making the existing health care system more amenable to those driving large truck rigs. 相似文献
83.
Designing and integrating composite networks for monitoring multivariate gaussian pollution fields 总被引:2,自引:0,他引:2
J. V. Zidek W. Sun & N. D. Le 《Journal of the Royal Statistical Society. Series C, Applied statistics》2000,49(1):63-79
Networks of ambient monitoring stations are used to monitor environmental pollution fields such as those for acid rain and air pollution. Such stations provide regular measurements of pollutant concentrations. The networks are established for a variety of purposes at various times so often several stations measuring different subsets of pollutant concentrations can be found in compact geographical regions. The problem of statistically combining these disparate information sources into a single 'network' then arises. Capitalizing on the efficiencies so achieved can then lead to the secondary problem of extending this network. The subject of this paper is a set of 31 air pollution monitoring stations in southern Ontario. Each of these regularly measures a particular subset of ionic sulphate, sulphite, nitrite and ozone. However, this subset varies from station to station. For example only two stations measure all four. Some measure just one. We describe a Bayesian framework for integrating the measurements of these stations to yield a spatial predictive distribution for unmonitored sites and unmeasured concentrations at existing stations. Furthermore we show how this network can be extended by using an entropy maximization criterion. The methods assume that the multivariate response field being measured has a joint Gaussian distribution conditional on its mean and covariance function. A conjugate prior is used for these parameters, some of its hyperparameters being fitted empirically. 相似文献
84.
It is shown that the uncertainty connected with a `random in a broad sense' (not necessarily stochastic) event always has some `statistical regularity' (SR) in the form of a family of finite-additive probability distributions. The specific principle of guaranteed result in decision making is introduced. It is shown that observing this principle of guaranteed result leads to determine the one optimality criterion corresponding to a decision system with a given `statistical regularity'. 相似文献
85.
The authors show how saddlepoint techniques lead to highly accurate approximations for Bayesian predictive densities and cumulative distribution functions in stochastic model settings where the prior is tractable, but not necessarily the likelihood or the predictand distribution. They consider more specifically models involving predictions associated with waiting times for semi‐Markov processes whose distributions are indexed by an unknown parameter θ. Bayesian prediction for such processes when they are not stationary is also addressed and the inverse‐Gaussian based saddlepoint approximation of Wood, Booth & Butler (1993) is shown to accurately deal with the nonstationarity whereas the normal‐based Lugannani & Rice (1980) approximation cannot, Their methods are illustrated by predicting various waiting times associated with M/M/q and M/G/1 queues. They also discuss modifications to the matrix renewal theory needed for computing the moment generating functions that are used in the saddlepoint methods. 相似文献
86.
ABSTRACTWe introduce a new methodology for estimating the parameters of a two-sided jump model, which aims at decomposing the daily stock return evolution into (unobservable) positive and negative jumps as well as Brownian noise. The parameters of interest are the jump beta coefficients which measure the influence of the market jumps on the stock returns, and are latent components. For this purpose, at first we use the Variance Gamma (VG) distribution which is frequently used in modeling financial time series and leads to the revelation of the hidden market jumps' distributions. Then, our method is based on the central moments of the stock returns for estimating the parameters of the model. It is proved that the proposed method provides always a solution in terms of the jump beta coefficients. We thus achieve a semi-parametric fit to the empirical data. The methodology itself serves as a criterion to test the fit of any sets of parameters to the empirical returns. The analysis is applied to NASDAQ and Google returns during the 2006–2008 period. 相似文献
87.
Dobbs Cynnamon Escobedo Francisco J. Clerici Nicola de la Barrera Francisco Eleuterio Ana Alice MacGregor-Fors Ian Reyes-Paecke Sonia Vásquez Alexis Zea Camaño Jorge Danilo Hernández H. Jaime 《Urban Ecosystems》2019,22(1):173-187
Urban Ecosystems - Latin America and the Caribbean (LAC) is one of the most urbanized and biologically diverse regions in the world but is often characterized by weak environmental governance and... 相似文献
88.
V. Zardasht 《Journal of Statistical Computation and Simulation》2019,89(8):1516-1525
In this paper, we introduce a new test for the dilation order based on cumulative residual Tsallis entropy of order α. The effect of the values of parameter α on the power of the test statistics is numerically investigated. The asymptotic distribution of the test statistic is given. The performance of the test statistic is evaluated using a simulation study. Finally, some numerical examples illustrating the theory are also given. 相似文献
89.
In a recent research, the quasi-likelihood estimation methodology was developed to estimate the regression effects in the Generalized BINMA(1) (GBINMA(1)) process. The method provides consistent parameter estimates but, in the intermediate computations, moment estimating equations were used to estimate the serial- and cross-correlation parameters. This procedure may not result optimal parameter estimates, in particular, for the regression effects. This paper provides an alternative simpler GBINMA(1) process based on multivariate thinning properties where the main effects are estimated via a robust generalized quasi-likelihood (GQL) estimation approach. The two techniques are compared through some simulation experiments. A real-life data application is studied. 相似文献
90.