全文获取类型
收费全文 | 11899篇 |
免费 | 190篇 |
国内免费 | 2篇 |
专业分类
管理学 | 1587篇 |
民族学 | 81篇 |
人才学 | 4篇 |
人口学 | 1669篇 |
丛书文集 | 26篇 |
教育普及 | 2篇 |
理论方法论 | 862篇 |
综合类 | 174篇 |
社会学 | 5882篇 |
统计学 | 1804篇 |
出版年
2020年 | 102篇 |
2019年 | 134篇 |
2018年 | 678篇 |
2017年 | 692篇 |
2016年 | 554篇 |
2015年 | 127篇 |
2014年 | 175篇 |
2013年 | 1424篇 |
2012年 | 298篇 |
2011年 | 662篇 |
2010年 | 527篇 |
2009年 | 453篇 |
2008年 | 494篇 |
2007年 | 557篇 |
2006年 | 202篇 |
2005年 | 259篇 |
2004年 | 250篇 |
2003年 | 226篇 |
2002年 | 193篇 |
2001年 | 165篇 |
2000年 | 191篇 |
1999年 | 150篇 |
1998年 | 150篇 |
1997年 | 124篇 |
1996年 | 145篇 |
1995年 | 137篇 |
1994年 | 150篇 |
1993年 | 137篇 |
1992年 | 146篇 |
1991年 | 159篇 |
1990年 | 176篇 |
1989年 | 154篇 |
1988年 | 168篇 |
1987年 | 140篇 |
1986年 | 141篇 |
1985年 | 141篇 |
1984年 | 160篇 |
1983年 | 140篇 |
1982年 | 105篇 |
1981年 | 89篇 |
1980年 | 98篇 |
1979年 | 119篇 |
1978年 | 94篇 |
1977年 | 74篇 |
1976年 | 87篇 |
1975年 | 55篇 |
1974年 | 68篇 |
1973年 | 53篇 |
1971年 | 44篇 |
1970年 | 48篇 |
排序方式: 共有10000条查询结果,搜索用时 187 毫秒
81.
82.
OGBURN WF 《AJS; American journal of sociology》1948,53(6):474-476
83.
There are many models that require the estimation of a set of ordered parameters. For example, multivariate analysis of variance often is formulated as testing for the equality of the parameters versus an ordered alternative. This problem, referred to as isotonic inference, constrained inference, or isotonic regression, has led to the development of general solutions, not often easy to apply in special models. In this expository paper, we study the special case of a separable convex quadratic programming problem for which the optimality conditions lead to a readily solved linear complementarity problem in the Lagrange multipliers, and subsequently to an equivalent linear programming problem, whose solution can be used to recover the solution of the original isotonic problem. The method can be applied to estimating ordered correlations, ordered binomial probabilities, ordered Poisson parameters, ordered exponential scale parameters, or ordered risk differences. 相似文献
84.
Yen Steven T. Douglass Shaw W. Eiswerth Mark E. 《Review of Economics of the Household》2004,2(1):73-88
Asthma patients' health status may be especially sensitive to some types of air pollution, but the evidence on this is mixed. We explore the effects of ground-level ozone on asthma patient's activities, breaking apart the usual aggregated category of leisure into indoor and outdoor activities, and differentiating those by whether the activities were active or inactive. Applying the semiparametric censored estimation method we demonstrate that even though the period over which activities were observed was relatively low in ozone levels, there is a significant impact of ozone on a few activities. The (non-ozone) economic and demographic variables in the model play significant roles in explaining the allocation of time among seven activities, suggesting the suitability of the approach for other household decision-making contexts. 相似文献
85.
Dwight R. Lee 《Journal of Labor Research》2003,24(3):437-446
Reverse mandated benefits is a government-mandated policy that requires employees to provide their employers with benefits
that workers would not provide otherwise. Of course, only those benefits would be mandated that are worth more to employers
than they cost, as determined by political authorities. My case for such a policy argues that it is at least as sensible as
policies mandating that employers provide benefits to their employees that would not be provided otherwise. 相似文献
86.
The risky business of insurance pricing 总被引:1,自引:1,他引:0
W. Kip Viscusi 《Journal of Risk and Uncertainty》1993,7(1):117-139
The factors influencing insurance pricing decisions are assessed using the ISO product liability ratemaking files for 1980–1984. The mean loss level has a strong positive effect on manual rates and premium rates/exposure. Evidence on a variety of ambiguity measures is more mixed. As a broad generalization, risk ambiguity lowers manual rates, which may reflect exclusion of large loss outliers as being unrepresentative. Risk ambiguity tends to have a positive effect on actual pricing decisions for particular policies, especially bodily injury lines and the interactive risk-ambiguity model. 相似文献
87.
Squared residual autocorrelations have been found useful in detecting departures from linearity in time series models. This is especially the case with data exhibiting heterogeneity in variances. A rank test is proposed which is much more robust than its parametric counterpart. 相似文献
88.
This study examines the relationships among personal coping resources, social support, external coping resources, job stressors and job strains in a sample of 110 American Telephone and Telegraph employees undergoing a major organizational restructuring. The study expanded on a model suggested by Ashford (1988) by defining another category of coping resources that employees may draw upon to deal with the stressors and strains which occur during major organizational changes. External coping resources were defined as those which provided employees with a sense of 'vicarious control' in stressful situations. Results indicated that personal coping resources, social support and external coping resources had a direct effect upon job stressor and strain levels. No 'buffering' effect of these coplng resources was found. Hierarchical regression analyses indicated that external coping resources added to the prediction of job stressors and strains even when pertonal coping resources and social support were entered first into the prediction questions. 相似文献
89.
We tested a mathematical model of psychological well-being (PWB) with data from a paradigm that included a negative mood induction followed by a positive induction. The propositions from the model encompass the hypothesis that the relative mood prior to either induction has implications for the magnitude of subsequent induction effects, such that relative mood is defined by current mood as a ratio of the prevailing mood that is predicted by the model. The findings confirm the hypothesis that the relative mood at baseline predicts mood change in a nonoverlapping time period, even after control for potentially mediating variables. 相似文献
90.
W R Hewitt 《Journal of American college health : J of ACH》1992,40(6):288-289
The author reports on a study of the liquid nitrogen treatment of warts at the Rutgers University Student Health Center. He demonstrates that liquid nitrogen therapy is a safe, effective treatment method, appropriate for use by nurses and other primary providers in a college health setting. 相似文献