全文获取类型
收费全文 | 130篇 |
免费 | 4篇 |
专业分类
管理学 | 23篇 |
人口学 | 12篇 |
理论方法论 | 10篇 |
社会学 | 25篇 |
统计学 | 64篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 2篇 |
2020年 | 6篇 |
2019年 | 5篇 |
2018年 | 1篇 |
2017年 | 15篇 |
2016年 | 7篇 |
2015年 | 7篇 |
2014年 | 9篇 |
2013年 | 15篇 |
2012年 | 11篇 |
2011年 | 7篇 |
2010年 | 8篇 |
2009年 | 3篇 |
2008年 | 7篇 |
2007年 | 4篇 |
2006年 | 4篇 |
2005年 | 4篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 5篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1993年 | 1篇 |
排序方式: 共有134条查询结果,搜索用时 15 毫秒
91.
The purpose of this study was to identify the motivational profiles of physically active older adults and to achieve a better understanding of their perceived motives to explain their regular physical activity behavior in relation to self-determination theory (SDT). To address these aims, this study used quantitative and qualitative approaches. Older adults (n = 92; M = 74.95, SD = 4.6) completed the French version of the Sport Motivational Scale. A cluster analysis showed two motivational profiles with differential motivational patterns. The first was named the high combined profile, with high scores on intrinsic motivation and introjected regulation and low levels of external regulation. The second profile was the low to moderate motivational profile, with low scores on intrinsic motivation and moderate scores on introjected regulation. The qualitative study's results demonstrate the usefulness of SDT in explaining the relationship between these motivational profiles and the intertwining of the three basic psychological needs. 相似文献
92.
93.
Abdelkamel Alj Rajae Azrak Christophe Ley Guy Mélard 《Scandinavian Journal of Statistics》2017,44(3):617-635
This paper is about vector autoregressive‐moving average models with time‐dependent coefficients to represent non‐stationary time series. Contrary to other papers in the univariate case, the coefficients depend on time but not on the series' length n. Under appropriate assumptions, it is shown that a Gaussian quasi‐maximum likelihood estimator is almost surely consistent and asymptotically normal. The theoretical results are illustrated by means of two examples of bivariate processes. It is shown that the assumptions underlying the theoretical results apply. In the second example, the innovations are marginally heteroscedastic with a correlation ranging from ?0.8 to 0.8. In the two examples, the asymptotic information matrix is obtained in the Gaussian case. Finally, the finite‐sample behaviour is checked via a Monte Carlo simulation study for n from 25 to 400. The results confirm the validity of the asymptotic properties even for short series and the asymptotic information matrix deduced from the theory. 相似文献
94.
In this paper we provide a theoretical contribution to the pointwise mean squared error of an adaptive multidimensional term-by-term thresholding wavelet estimator. A general result exhibiting fast rates of convergence under mild assumptions on the model is proved. It can be applied for a wide range of non parametric models including possible dependent observations. We give applications of this result for the non parametric regression function estimation problem (with random design) and the conditional density estimation problem. 相似文献
95.
Model-based clustering of Gaussian copulas for mixed data 总被引:1,自引:0,他引:1
Clustering of mixed data is important yet challenging due to a shortage of conventional distributions for such data. In this article, we propose a mixture model of Gaussian copulas for clustering mixed data. Indeed copulas, and Gaussian copulas in particular, are powerful tools for easily modeling the distribution of multivariate variables. This model clusters data sets with continuous, integer, and ordinal variables (all having a cumulative distribution function) by considering the intra-component dependencies in a similar way to the Gaussian mixture. Indeed, each component of the Gaussian copula mixture produces a correlation coefficient for each pair of variables and its univariate margins follow standard distributions (Gaussian, Poisson, and ordered multinomial) depending on the nature of the variable (continuous, integer, or ordinal). As an interesting by-product, this model generalizes many well-known approaches and provides tools for visualization based on its parameters. The Bayesian inference is achieved with a Metropolis-within-Gibbs sampler. The numerical experiments, on simulated and real data, illustrate the benefits of the proposed model: flexible and meaningful parameterization combined with visualization features. 相似文献
96.
97.
Jean-Michel Bécu Yves Grandvalet Christophe Ambroise Cyril Dalmasso 《Statistics and Computing》2017,27(1):169-179
Numerous variable selection methods rely on a two-stage procedure, where a sparsity-inducing penalty is used in the first stage to predict the support, which is then conveyed to the second stage for estimation or inference purposes. In this framework, the first stage screens variables to find a set of possibly relevant variables and the second stage operates on this set of candidate variables, to improve estimation accuracy or to assess the uncertainty associated to the selection of variables. We advocate that more information can be conveyed from the first stage to the second one: we use the magnitude of the coefficients estimated in the first stage to define an adaptive penalty that is applied at the second stage. We give the example of an inference procedure that highly benefits from the proposed transfer of information. The procedure is precisely analyzed in a simple setting, and our large-scale experiments empirically demonstrate that actual benefits can be expected in much more general situations, with sensitivity gains ranging from 50 to 100 % compared to state-of-the-art. 相似文献
98.
Christophe Z. Guilmoto 《Population studies》2015,69(3):299-315
Indonesia is usually viewed as a country free of the acute forms of gender discrimination observed elsewhere in East or South Asia, a situation often ascribed to Indonesia's bilateral kinship system. I re-examine this hypothesis by focusing on ethnic and regional variations in sex differentials. New indicators of marriage practices and gender bias derived from 2010 census microdata highlight the presence of patrilocal patterns as well as a distinct presence of son preference in fertility behaviour in many parts of the archipelago. I also present evidence for excessive child sex ratios and excess mortality of females in some areas that appear to be related to son preference and patrilocal residence systems. The findings confirm the association between son preference, sex differentials in mortality, prenatal sex selection, and kinship systems. I conclude with a more regional perspective on demographic vulnerability of females, distinguishing bilateral South East Asia from more patrilineal Melanesia. 相似文献
99.
Christophe Demattei 《Journal of applied statistics》2010,37(3):415-424
The aim of this paper is to propose a pedagogical explanation of the Le Cam theorem and to illustrate its use, through a practical application, for temporal cluster detection. This theorem focusses on the interval division by randomly chosen points. The aim of the theorem is to characterize the asymptotic behavior of a certain category of sums of functions applied to the length of successive intervals between points. It is not very intuitive and its understanding needs some deepening. After enouncing the theorem, its different aspects are explained and detailed in a way as pedagogical as possible. Theoretical applications are proposed through the proof of two propositions. Then a very concrete application of this theorem for temporal cluster detection is presented, tested by a power study, and compared with other global cluster detection tests. Finally, this approach is applied to the well-known Knox temporal data set. 相似文献
100.
Gaussian Graphical Models provide a convenient framework for representing dependencies between variables. Recently, this tool
has received a high interest for the discovery of biological networks. The literature focuses on the case where a single network
is inferred from a set of measurements. But, as wetlab data is typically scarce, several assays, where the experimental conditions
affect interactions, are usually merged to infer a single network. In this paper, we propose two approaches for estimating
multiple related graphs, by rendering the closeness assumption into an empirical prior or group penalties. We provide quantitative
results demonstrating the benefits of the proposed approaches. The methods presented in this paper are embeded in the R package simone from version 1.0-0 and later. 相似文献