全文获取类型
收费全文 | 262篇 |
免费 | 4篇 |
专业分类
管理学 | 24篇 |
人口学 | 26篇 |
理论方法论 | 26篇 |
综合类 | 1篇 |
社会学 | 93篇 |
统计学 | 96篇 |
出版年
2023年 | 4篇 |
2022年 | 6篇 |
2021年 | 6篇 |
2020年 | 8篇 |
2019年 | 14篇 |
2018年 | 15篇 |
2017年 | 20篇 |
2016年 | 12篇 |
2015年 | 5篇 |
2014年 | 16篇 |
2013年 | 43篇 |
2012年 | 23篇 |
2011年 | 7篇 |
2010年 | 12篇 |
2009年 | 5篇 |
2008年 | 8篇 |
2007年 | 6篇 |
2006年 | 3篇 |
2005年 | 6篇 |
2004年 | 4篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 5篇 |
1997年 | 1篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1990年 | 3篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有266条查询结果,搜索用时 15 毫秒
51.
52.
Laurie Mook Jorge Sousa Susan Elgie Jack Quarter 《Nonprofit management & leadership》2005,15(4):401-415
There is a need for an accounting paradigm that properly illustrates the value that nonprofits generate. Much of that value comes from volunteer contributions, which are significant but for the most part are not included in financial accounting statements, even though our research indicates that they account for almost a third of the value added by these organizations. This article reports the results of two studies related to measuring volunteer value in the accounting of nonprofits and then draws some policy implications from the research. The first study, a survey of 156 nonprofits in Canada, found that although about one‐third of the sample kept records of volunteer hours, only 3 percent included a value for them in their accounting statements. The second study, of nonprofit accountants, found that they did not feel that financial accounting statements properly represented the contribution of their organizations. A series of policy recommendations are presented, including suggestions for revising the regulations of accounting bodies for imputing volunteer value and creating accounting statements that better represent the contribution of nonprofits. 相似文献
53.
DISTRIBUTIONAL CHARACTERIZATIONS THROUGH SCALING RELATIONS 总被引:2,自引:0,他引:2
Investigated here are aspects of the relation between the laws of X and Y where X is represented as a randomly scaled version of Y. In the case that the scaling has a beta law, the law of Y is expressed in terms of the law of X. Common continuous distributions are characterized using this beta scaling law, and choosing the distribution function of Y as a weighted version of the distribution function of X, where the weight is a power function. It is shown, without any restriction on the law of the scaling, but using a one‐parameter family of weights which includes the power weights, that characterizations can be expressed in terms of known results for the power weights. Characterizations in the case where the distribution function of Y is a positive power of the distribution function of X are examined in two special cases. Finally, conditions are given for existence of inverses of the length‐bias and stationary‐excess operators. 相似文献
54.
Jorge F. Perez-Quezada Nicanor Z. Saliendra William E. Emmerich Emilio A. Laca 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》2007,170(1):213-230
Summary. The process of quality control of micrometeorological and carbon dioxide (CO2 ) flux data can be subjective and may lack repeatability, which would undermine the results of many studies. Multivariate statistical methods and time series analysis were used together and independently to detect and replace outliers in CO2 flux data derived from a Bowen ratio energy balance system. The results were compared with those produced by five experts who applied the current and potentially subjective protocol. All protocols were tested on the same set of three 5-day periods, when measurements were conducted in an abandoned agricultural field. The concordance of the protocols was evaluated by using the experts' opinion (mean ± 1.96 standard deviations) as a reference interval (the Bland–Altman method). Analysing the 15 days together, the statistical protocol that combined multivariate distance, multiple linear regression and time series analysis showed a concordance of 93% on a 20-min flux basis and 87% on a daily basis (only 2 days fell outside the reference interval), and the overall flux differed only by 1.7% (3.2 g CO2 m−2 ). An automated version of this or a similar statistical protocol could be used as a standard way of filling gaps and processing data from Bowen ratio energy balance and other techniques (e.g. eddy covariance). This would enforce objectivity in comparisons of CO2 flux data that are generated by different research groups and streamline the protocols for quality control. 相似文献
55.
The article considers the problem of choosing between two (possibly) nonlinear models that have been fitted to the same data using M-estimation methods. An asymptotically normally distributed test statistic that takes into account the fact that the models are fitted robustly is given. The new procedure is compared with other test statistics using a Monte Carlo study. We found that the presence of a competitive model either in the null or the alternative hipothesis affects the distributional properties of the tests, and that in the case that the data contains outlying observations the new procedure had a significantly higher power than the rest of the tests. 相似文献
56.
Lorenzo Hernández Jorge Tejero Alberto Suárez Santiago Carrillo-Menéndez 《Statistics and Computing》2014,24(3):377-397
A perturbative approach is used to derive approximations of arbitrary order to estimate high percentiles of sums of positive independent random variables that exhibit heavy tails. Closed-form expressions for the successive approximations are obtained both when the number of terms in the sum is deterministic and when it is random. The zeroth order approximation is the percentile of the maximum term in the sum. Higher orders in the perturbative series involve the right-truncated moments of the individual random variables that appear in the sum. These censored moments are always finite. As a result, and in contrast to previous approximations proposed in the literature, the perturbative series has the same form regardless of whether these random variables have a finite mean or not. For high percentiles, and specially for heavier tails, the quality of the estimate improves as more terms are included in the series, up to a certain order. Beyond that order the convergence of the series deteriorates. Nevertheless, the approximations obtained by truncating the perturbative series at intermediate orders are remarkably accurate for a variety of distributions in a wide range of parameters. 相似文献
57.
We describe a criterion to evaluate subsets of a finite set of alternatives which are considered as opportunity sets. The axioms for set comparison are motivated within the preference for flexibility framework. We assume the preference over
the universal set of alternatives to be made of two disjoint binary relations. The result is the axiomatic characterization
of a procedure which is formally similar to the leximax ordering, but in our case it incorporates the presence of some uncertainty
about the decision-maker final tastes.
Received: 20 January 1999/Accepted: 20 October 1999 相似文献
58.
The life lengths of the units in a system can be modelled by a bivariate distribution. In this paper, we suppose that the
joint distribution of the units is a symmetric bivariate Pareto (Lomax) distribution. For this model, we obtain basic reliability
properties for series and parallel systems.
J. M. Ruiz Partially Supported by Ministerio de Ciencia y Tecnologia under grant BFM2003-02947 and Fundacion Seneca under
grant 00698/PI/04. 相似文献
59.
Valdiney V. Gouveia Taciano L. Milfont Patrícia Nunes da Fonseca Jorge Artur Peçanha de Miranda Coelho 《Social indicators research》2009,90(2):267-277
The aim of this paper was to validate the Brazilian-Portuguese version of the Satisfaction With Life Scale (SWLS), presenting
evidence of its reliability and construct and criterion-related validity. A large Brazilian sample (2,180 participants), from
five different populations (undergraduate and high school students, general population, elementary school teachers, and physicians),
was considered. The results confirmed the single factorial structure and reliability (0.77 < Cronbach’s α < 0.88, mean α = 0.81)
of the SWLS. Supporting its criterion-related validity, the SWLS correlated positively with positive affect and negatively
with both negative affect and psychological distress across all five samples. The findings indicate that the Brazilian-Portuguese
version of the SWLS is a valid instrument to use with diverse Brazilian samples. 相似文献
60.
Jorge Morales Pedraza 《Public Organization Review》2012,12(1):57-70
Biological weapons are considered, by the international community, as a weapon of mass destruction. When the Biological Weapons
Convention (BWC) was negotiated during the 1960s and early 1970s, the negotiators considered unnecessary the establishment
of an international organisation to supervise the implementation of the Convention’s provisions by the State parties. It is
important to highlight that since the entry into force of the BWC, the international situation has significantly changed.
For this reason perhaps the moment has arrived to consider again the proposal of settling down such an organisation in the
framework of the strengthening the BWC. 相似文献