全文获取类型
收费全文 | 3735篇 |
免费 | 84篇 |
国内免费 | 15篇 |
专业分类
管理学 | 380篇 |
民族学 | 6篇 |
人口学 | 69篇 |
丛书文集 | 54篇 |
理论方法论 | 95篇 |
综合类 | 353篇 |
社会学 | 250篇 |
统计学 | 2627篇 |
出版年
2024年 | 1篇 |
2023年 | 27篇 |
2022年 | 32篇 |
2021年 | 38篇 |
2020年 | 62篇 |
2019年 | 108篇 |
2018年 | 154篇 |
2017年 | 226篇 |
2016年 | 114篇 |
2015年 | 118篇 |
2014年 | 121篇 |
2013年 | 854篇 |
2012年 | 271篇 |
2011年 | 140篇 |
2010年 | 123篇 |
2009年 | 154篇 |
2008年 | 146篇 |
2007年 | 143篇 |
2006年 | 118篇 |
2005年 | 133篇 |
2004年 | 111篇 |
2003年 | 92篇 |
2002年 | 71篇 |
2001年 | 74篇 |
2000年 | 67篇 |
1999年 | 55篇 |
1998年 | 50篇 |
1997年 | 38篇 |
1996年 | 19篇 |
1995年 | 16篇 |
1994年 | 27篇 |
1993年 | 17篇 |
1992年 | 19篇 |
1991年 | 13篇 |
1990年 | 11篇 |
1989年 | 8篇 |
1988年 | 12篇 |
1987年 | 7篇 |
1986年 | 4篇 |
1985年 | 8篇 |
1984年 | 6篇 |
1983年 | 9篇 |
1982年 | 8篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有3834条查询结果,搜索用时 15 毫秒
101.
邹建玲 《上海理工大学学报(社会科学版)》2017,39(1):5-9
明晰学术英语与学术英语写作、学术能力与学术写作能力的概念区别;综述国内外几十年来的学术英语写作能力的培养研究;提出对非英语专业研究生学术英语写作能力的培养模式:以学术阅读带动学术写作能力的提高,以体裁分析理论为基础的互动学习,写作技能训练与研究生专业知识相结合,面授知识与网络自主学习相结合。 相似文献
102.
For the most part, strategy, entrepreneurship, and innovation have been researched and practiced from a representational position. In this paper, we make a case for taking a performative turn. Strategists, entrepreneurs, and intrapreneurs are embedded-embodied actors who engage in material-discursive practices in their attempts at constituting phenomena. Overflows, which are inevitable given dispersion of agency, give rise to matters of concern for multiple stakeholder groups. Settlements between stakeholders are temporary, as phenomena will be de-constituted when constitutive arrangements change. Consequently, the projects and initiatives that strategists, entrepreneurs, and intrapreneurs undertake are best seen as ongoing journeys. 相似文献
103.
Business Modelling has evolved as a key activity to reflect new business venture strategy by framing the way a firm will operate and how it will function in achieving its goals (e.g., profitability, growth, innovation, social impact). However, scholars and practitioners have criticized the adoption of a too static perspective in the design and use of conventional Business Model representations. Such a static perspective prevents nascent entrepreneurs experimenting with their Business Models and, as a result, identifying the most effective strategies, especially in terms of business sustainability and profitability. In this paper, we argue that combining conventional Business Model schemas with System Dynamics modelling results in a strategy design tool that may overcome several limitations related to a static view of Business Model representation. Mapping the different key elements underlying value creation processes into a system of causal interdependencies – through the use of simulation – allows strategy analysts and entrepreneurs to experiment and learn how the business reacts to strategic and organizational changes in terms of performance, innovation and value creation. As such, Dynamic Business Models provide useful insights to strategy formulation and business venturing by capturing how critical Business Model elements interact to produce enduring competitive advantages over time. 相似文献
104.
Øystein Kravdal 《Population studies》2018,72(2):139-156
There is still considerable uncertainty about how reproductive factors affect child mortality. This study, based on Demographic and Health Survey data from 28 countries in sub-Saharan Africa, shows that mortality is highest for firstborn children with very young mothers. Other children with young mothers, or of high birth order, also experience high mortality. Net of maternal age and birth order, a short preceding birth interval is associated with above average mortality. These patterns change, however, if time-invariant unobserved mother-level characteristics of importance for both mortality and fertility are controlled for in a multilevel–multiprocess model. Most importantly, there are smaller advantages associated with longer birth intervals and being older at first birth. The implications of alternative reproductive ‘strategies’ are discussed, taking into account that if the mother is older at birth, the child will also be born in a later calendar year, when mortality may be lower. 相似文献
105.
Allison E. Flittner O'Grady Shawn D. Whiteman Shelley M. MacDermid Wadsworth 《Journal of marriage and the family》2018,80(2):569-581
This study examined how changes in at‐home parents' mental health and parenting practices related to changes in their children's adjustment throughout the course of a service members' military deployment. Participants included at‐home parents from 114 National Guard families who were interviewed at four different occasions across the deployment cycle. The results revealed changes across the deployment cycle among the following three indicators: parental warmth, depressive symptoms, and children's externalizing behaviors. Changes in parental warmth were associated with changes in children's adjustment. Overall, these findings indicate that during parental separation, at‐home parents' responses to children have important implications for children's adjustment. 相似文献
106.
Approximate Bayesian inference for latent Gaussian models by using integrated nested Laplace approximations 总被引:7,自引:0,他引:7
Håvard Rue Sara Martino Nicolas Chopin 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2009,71(2):319-392
Summary. Structured additive regression models are perhaps the most commonly used class of models in statistical applications. It includes, among others, (generalized) linear models, (generalized) additive models, smoothing spline models, state space models, semiparametric regression, spatial and spatiotemporal models, log-Gaussian Cox processes and geostatistical and geoadditive models. We consider approximate Bayesian inference in a popular subset of structured additive regression models, latent Gaussian models , where the latent field is Gaussian, controlled by a few hyperparameters and with non-Gaussian response variables. The posterior marginals are not available in closed form owing to the non-Gaussian response variables. For such models, Markov chain Monte Carlo methods can be implemented, but they are not without problems, in terms of both convergence and computational time. In some practical applications, the extent of these problems is such that Markov chain Monte Carlo sampling is simply not an appropriate tool for routine analysis. We show that, by using an integrated nested Laplace approximation and its simplified version, we can directly compute very accurate approximations to the posterior marginals. The main benefit of these approximations is computational: where Markov chain Monte Carlo algorithms need hours or days to run, our approximations provide more precise estimates in seconds or minutes. Another advantage with our approach is its generality, which makes it possible to perform Bayesian analysis in an automatic, streamlined way, and to compute model comparison criteria and various predictive measures so that models can be compared and the model under study can be challenged. 相似文献
107.
For regression on state and transition probabilities in multi-state models Andersen et al. (Biometrika 90:15–27, 2003) propose
a technique based on jackknife pseudo-values. In this article we analyze the pseudo-values suggested for competing risks models
and prove some conjectures regarding their asymptotics (Klein and Andersen, Biometrics 61:223–229, 2005). The key is a second
order von Mises expansion of the Aalen-Johansen estimator which yields an appropriate representation of the pseudo-values.
The method is illustrated with data from a clinical study on total joint replacement. In the application we consider for comparison
the estimates obtained with the Fine and Gray approach (J Am Stat Assoc 94:496–509, 1999) and also time-dependent solutions
of pseudo-value regression equations. 相似文献
108.
M. P. Wand 《Australian & New Zealand Journal of Statistics》2009,51(1):9-41
Semiparametric regression models that use spline basis functions with penalization have graphical model representations. This link is more powerful than previously established mixed model representations of semiparametric regression, as a larger class of models can be accommodated. Complications such as missingness and measurement error are more naturally handled within the graphical model architecture. Directed acyclic graphs, also known as Bayesian networks, play a prominent role. Graphical model-based Bayesian 'inference engines', such as bugs and vibes , facilitate fitting and inference. Underlying these are Markov chain Monte Carlo schemes and recent developments in variational approximation theory and methodology. 相似文献
109.
David E. Tyler Frank Critchley Lutz Dümbgen Hannu Oja 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2009,71(3):549-592
Summary. A general method for exploring multivariate data by comparing different estimates of multivariate scatter is presented. The method is based on the eigenvalue–eigenvector decomposition of one scatter matrix relative to another. In particular, it is shown that the eigenvectors can be used to generate an affine invariant co-ordinate system for the multivariate data. Consequently, we view this method as a method for invariant co-ordinate selection . By plotting the data with respect to this new invariant co-ordinate system, various data structures can be revealed. For example, under certain independent components models, it is shown that the invariant co- ordinates correspond to the independent components. Another example pertains to mixtures of elliptical distributions. In this case, it is shown that a subset of the invariant co-ordinates corresponds to Fisher's linear discriminant subspace, even though the class identifications of the data points are unknown. Some illustrative examples are given. 相似文献
110.
Edwin M. M. Ortega Fernanda B. Rizzato Clarice G. B. Demétrio 《Statistical Methods and Applications》2009,18(3):305-331
In a sample of censored survival times, the presence of an immune proportion of individuals who are not subject to death,
failure or relapse, may be indicated by a relatively high number of individuals with large censored survival times. In this
paper the generalized log-gamma model is modified for the possibility that long-term survivors may be present in the data.
The model attempts to separately estimate the effects of covariates on the surviving fraction, that is, the proportion of
the population for which the event never occurs. The logistic function is used for the regression model of the surviving fraction.
Inference for the model parameters is considered via maximum likelihood. Some influence methods, such as the local influence
and total local influence of an individual are derived, analyzed and discussed. Finally, a data set from the medical area
is analyzed under the log-gamma generalized mixture model. A residual analysis is performed in order to select an appropriate
model.
The authors would like to thank the editor and referees for their helpful comments. This work was supported by CNPq, Brazil. 相似文献