全文获取类型
收费全文 | 28571篇 |
免费 | 511篇 |
专业分类
管理学 | 3717篇 |
民族学 | 195篇 |
人才学 | 6篇 |
人口学 | 4015篇 |
丛书文集 | 109篇 |
教育普及 | 2篇 |
理论方法论 | 2205篇 |
现状及发展 | 1篇 |
综合类 | 515篇 |
社会学 | 13560篇 |
统计学 | 4757篇 |
出版年
2023年 | 93篇 |
2022年 | 76篇 |
2021年 | 93篇 |
2020年 | 286篇 |
2019年 | 460篇 |
2018年 | 2029篇 |
2017年 | 2234篇 |
2016年 | 1479篇 |
2015年 | 392篇 |
2014年 | 474篇 |
2013年 | 3176篇 |
2012年 | 971篇 |
2011年 | 1673篇 |
2010年 | 1459篇 |
2009年 | 1187篇 |
2008年 | 1279篇 |
2007年 | 1461篇 |
2006年 | 471篇 |
2005年 | 641篇 |
2004年 | 661篇 |
2003年 | 601篇 |
2002年 | 474篇 |
2001年 | 482篇 |
2000年 | 403篇 |
1999年 | 404篇 |
1998年 | 314篇 |
1997年 | 286篇 |
1996年 | 319篇 |
1995年 | 273篇 |
1994年 | 261篇 |
1993年 | 253篇 |
1992年 | 291篇 |
1991年 | 294篇 |
1990年 | 266篇 |
1989年 | 260篇 |
1988年 | 261篇 |
1987年 | 232篇 |
1986年 | 221篇 |
1985年 | 249篇 |
1984年 | 239篇 |
1983年 | 240篇 |
1982年 | 181篇 |
1981年 | 160篇 |
1980年 | 174篇 |
1979年 | 174篇 |
1978年 | 142篇 |
1977年 | 141篇 |
1976年 | 125篇 |
1975年 | 120篇 |
1974年 | 98篇 |
排序方式: 共有10000条查询结果,搜索用时 187 毫秒
21.
22.
As important members of research teams, statisticians bear an ethical responsibility to analyze, interpret, and report data honestly and objectively. One way of reinforcing ethical responsibilities is through required courses covering a variety of ethics-related topics at the graduate level. We assessed ethics requirements for graduate-level statistics training programs in the United States for the 2013–2014 academic year using the websites of 88 universities, examining 103 biostatistics programs, and 136 statistics degree programs. We categorized programs’ ethics training requirements as required or not required. Thirty-one (35.1%) universities required an ethics course for at least some degree students. Sixty-two (25.5%) degree programs required an ethics course for at least some students. The majority (77.4%) of required courses were worth 0 or 1 credit. Of the 177 programs without an ethics requirement, 19 (10.7%) listed an ethics elective. Although a single ethics course is insufficient for instilling an ethical approach to science, degree programs that model expectations through coursework point to the value of ethics in science. More training programs should prepare statisticians to consider the ethical dimensions of their work through required coursework. Supplementary materials for this article are available online. 相似文献
23.
This paper develops a unified model of dual and unitary job holding based on a Stone-Geary utility function. The model incorporates both constrained and unconstrained labor supply. Panel data methods are adapted to accommodate unobserved heterogeneity and multinomial selection into six mutually exclusive labor supply regimes. We estimate the wage and income elasticities arising from selection and unobserved heterogeneity as well as from the Stone-Geary Slutsky equations. The labor supply model is estimated with data from the British Household Panel Survey 1991–2008. Among dual job holders, our study finds that the Stone-Geary income and wage elasticities are much larger for labor supply to the second job compared with the main job. When the effects of selection and unobserved heterogeneity are taken account of, the magnitudes of these elasticities on the second job tend to be significantly reduced. 相似文献
24.
Economic theory establishes that pension privatization weakens the link between old and young and so reduces the incentive to invest in public education in an economy with lower return rate of capital than growth rate of wage. However, empirical studies of the link change are few. In this paper, we investigate the effects of pension privatization and the central government’s subsidy to individual accounts on public education spending in a three-period overlapping generation model. And then, we take contemporary pension reforms in a number of Chinese provinces as offering natural experiment conditions. Using a difference-in-difference framework and 282 municipal districts panel data over years 1998–2009, we test the pension-education theoretical link change. Both our theoretical and empirical results confirm that pension privatization is adversely associated with local public spending on education in China. Private pension subsidies, moreover, magnify this effect. Our study supports the theoretical assertion and selective empirical findings of a negative intergenerational effect of pension privatization. 相似文献
25.
The emerging digital transformation in the twenty‐first century is rapidly and significantly changing the business landscape. The fast‐changing activities, expectations and new modes of collaboration suggest it is time to review the current theoretical insights from strategic alliance (SA) research, which are based on assumptions from a different era. We therefore aim to stimulate multidisciplinary debate and theoretical reflections to better understand emerging paradoxes and challenges that contemporary firms face in the formation, evolution and dissolution of strategic alliances. Specifically, we offer alternative visions of SA research and suggest fresh applications or supplements of existing theoretical perspectives and research methods that can better address the research questions emerging from an era of digital transformation. 相似文献
26.
From the inception of the proportional representation movement it has been an issue whether larger parties are favored at
the expense of smaller parties in one apportionment of seats as compared to another apportionment. A number of methods have
been proposed and are used in countries with a proportional representation system. These apportionment methods exhibit a regularity
of order, as discussed in the present paper, that captures the preferential treatment of larger versus smaller parties. This
order, namely majorization, permits the comparison of seat allocations in two apportionments. For divisor methods, we show
that one method is majorized by another method if and only if their signpost ratios are increasing. This criterion is satisfied
for the divisor methods with power-mean rounding, and for the divisor methods with stationary rounding. Majorization places
the five traditional apportionment methods in the order as they are known to favor larger parties over smaller parties: Adams,
Dean, Hill, Webster, and Jefferson.
Received: 5 August 2000/Accepted: 24 October 2001 相似文献
27.
The authors maintain that the social learning theory of career development and counseling has not been applied to diverse populations. To address this gap in the literature, the authors conducted a qualitative analysis of interviews with 21 middle school students in a low‐income, culturally diverse, inner‐city public school. Four themes emerged, reflecting the influence of discrimination on participants' career learning: contextual barriers and resources for learning, and psychological barriers and resources for learning. The authors provide a conceptual framework for assessing resources and barriers and a rationale for why these aspects often remain hidden or unexamined in career assessment with clients who are vulnerable to discrimination. 相似文献
28.
Ackerly Brooke A. 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2002,13(3):322-324
VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - 相似文献
29.
Maureen Hannay 《Journal of Labor Research》2002,23(3):487-498
In 1999 the U.S. economy concluded its ninth year of expansion, and the GDP increased by 4.3 percent while the rate of unemployment
remained at 4.1 percent, its lowest level in thirty years. However, there has not been a corresponding expansion in the rate
of unionization. Recognizing that they can no longer depend on their traditional base of members, unions have targeted the
rapidly expanding area of professional employment as a potential growth area. If unions can adapt to the needs of these workers
and achieve organizing successes in nontraditional areas, rapid growth of the union movement could occur. Utilizing the case
study methodology, I explore the motivations of a group of professional employees to turn to union representation to address
their dissatisfaction with the workplace. 相似文献
30.
A.M. Mathai 《Revue canadienne de statistique》1993,21(3):277-283
The product of two independent or dependent scalar normal variables, sums of products, sample covariances, and general bilinear forms are considered. Their distributions are shown to belong to a class called generalized Laplacian. A growth-decay mechanism is also shown to produce such a generalized Laplacian. Sets of necessary and sufficient conditions are derived for bilinear forms to belong to this class. As a generalization, the distributions of rectangular matrices associated with multivariate normal random vectors are also discussed. 相似文献