全文获取类型
收费全文 | 9071篇 |
免费 | 200篇 |
国内免费 | 1篇 |
专业分类
管理学 | 1431篇 |
民族学 | 36篇 |
人口学 | 853篇 |
丛书文集 | 35篇 |
理论方法论 | 651篇 |
综合类 | 167篇 |
社会学 | 3841篇 |
统计学 | 2258篇 |
出版年
2023年 | 54篇 |
2020年 | 144篇 |
2019年 | 186篇 |
2018年 | 283篇 |
2017年 | 349篇 |
2016年 | 266篇 |
2015年 | 170篇 |
2014年 | 234篇 |
2013年 | 1470篇 |
2012年 | 328篇 |
2011年 | 288篇 |
2010年 | 210篇 |
2009年 | 209篇 |
2008年 | 188篇 |
2007年 | 234篇 |
2006年 | 206篇 |
2005年 | 207篇 |
2004年 | 190篇 |
2003年 | 170篇 |
2002年 | 185篇 |
2001年 | 225篇 |
2000年 | 208篇 |
1999年 | 179篇 |
1998年 | 133篇 |
1997年 | 131篇 |
1996年 | 131篇 |
1995年 | 110篇 |
1994年 | 110篇 |
1993年 | 98篇 |
1992年 | 144篇 |
1991年 | 124篇 |
1990年 | 118篇 |
1989年 | 114篇 |
1988年 | 97篇 |
1987年 | 91篇 |
1986年 | 97篇 |
1985年 | 111篇 |
1984年 | 115篇 |
1983年 | 127篇 |
1982年 | 99篇 |
1981年 | 89篇 |
1980年 | 86篇 |
1979年 | 95篇 |
1978年 | 92篇 |
1977年 | 81篇 |
1976年 | 70篇 |
1975年 | 70篇 |
1974年 | 59篇 |
1973年 | 63篇 |
1971年 | 53篇 |
排序方式: 共有9272条查询结果,搜索用时 136 毫秒
981.
982.
Spencer G. Niles 《The Career development quarterly》2003,52(1):70-77
The current challenges confronting career counselors require increased discourse regarding career counseling models. Some authors have initiated this discourse, but more participants are needed. The need also exists to communicate more aggressively the special expertise that career counselors bring to their work. As career counselors construct contemporary intervention models, they will need to engage in action research to demonstrate accountability and to document that their services are effective. Career counselors can embrace these activities by building on past practices to construct a vision for the future. 相似文献
983.
This article shows how admission and enrollment processes affect the interpretation of simple validation studies of academic performance. In a competitive market for students, optimal behavior of admissions committees and applicants drives the simple correlation between test scores and performance toward zero, regardless of the relationship in the population of prospective students. Data from our university's MBA program support the prediction that applicants exhibit a higher correlation between test scores and undergraduate GPAs than do current students. This suggests that standard validation studies will understate the importance of GMAT scores in predicting performance of potential MBA students. (JEL C24 , I121 , C52 ) 相似文献
984.
985.
Survey researchers since Cannell have worried that respondents may take various shortcuts to reduce the effort needed to complete a survey. The evidence for such shortcuts is often indirect. For instance, preferences for earlier versus later response options have been interpreted as evidence that respondents do not read beyond the first few options. This is really only a hypothesis, however, that is not supported by direct evidence regarding the allocation of respondent attention. In the current study, we used a new method to more directly observe what respondents do and do not look at by recording their eye movements while they answered questions in a Web survey. The eye-tracking data indicate that respondents do in fact spend more time looking at the first few options in a list of response options than those at the end of the list; this helps explain their tendency to select the options presented first regardless of their content. In addition, the eye-tracking data reveal that respondents are reluctant to invest effort in reading definitions of survey concepts that are only a mouse click away or paying attention to initially hidden response options. It is clear from the eye-tracking data that some respondents are more prone to these and other cognitive shortcuts than others, providing relatively direct evidence for what had been suspected based on more conventional measures. 相似文献
986.
We discuss the standard linear regression model with nonspherical disturbances, where some regressors are annihilated by considering only the residuals from an auxiliary regression, and where, analogous to the Frisch-Waugh procedure, the original GLS procedure is applied to the transformed data. We call this procedure pseudo-GLS and give conditions for pseudo-GL5 to be equal to genuine GLS. We also show via examples that these conditions are often violated in empirical applications, and that the Frisch-Waugh Theorem still “works” with nonspherical disturbances if efficient estimation is applied to both the original and the transformed data. 相似文献
987.
Ohne Zusammenfassung 相似文献
988.
This paper describes a Bayesian approach to modelling carcinogenity in animal studies where the data consist of counts of the number of tumours present over time. It compares two autoregressive hidden Markov models. One of them models the transitions between three latent states: an inactive transient state, a multiplying state for increasing counts and a reducing state for decreasing counts. The second model introduces a fourth tied state to describe non‐zero observations that are neither increasing nor decreasing. Both these models can model the length of stay upon entry of a state. A discrete constant hazards waiting time distribution is used to model the time to onset of tumour growth. Our models describe between‐animal‐variability by a single hierarchy of random effects and the within‐animal variation by first‐order serial dependence. They can be extended to higher‐order serial dependence and multi‐level hierarchies. Analysis of data from animal experiments comparing the influence of two genes leads to conclusions that differ from those of Dunson (2000). The observed data likelihood defines an information criterion to assess the predictive properties of the three‐ and four‐state models. The deviance information criterion is appropriately defined for discrete parameters. 相似文献
989.
Clinical trials and other types of studies often examine the effects of a particular treatment or experimental condition on a number of different response variables. Although the usual approach for analysing such data is to examine each variable separately, this can increase the chance of false positive findings. Bonferroni's inequality or Hotelling's T2 statistic can be employed to control the overall type I error rate, but these tests generally lack power for alternatives in which the treatment improves the outcome on most or all of the endpoints. For the comparison of independent groups, O'Brien (1984) developed a rank-sum type test that has greater power than the Bonferroni and T2 procedures when one treatment is uniformly better (i.e. for all endpoints) than the other treatment(s). In this paper we adapt the rank-sum test to studies involving paired data and demonstrate that it, too, has power advantages for such alternatives. Simulation results are described, and an example from a study measuring the effects of sleep loss on glucose metabolism is presented to illustrate the methodology. 相似文献
990.
在20世纪的最后30年里,西方及西方以外的历史思考和历史写作方面都出现了根本性的变化。现代历史学家确信:历史是连续的、片面的过程;坚持自己科学性权利的学术研究会把来源于客观学术研究的历史叙述置于世界历史的框架之中。到了20世纪,把历史看作“人文科学”的一种特殊类型的历史研究观逐渐被把历史看作一种“社会科学”的历史观所代替。然而,对社会科学和现代化普遍持有的信心在20世纪七、八十年代受到后现代主义哲学家和文学批评家的最激烈的声讨,也受到来自历史学家,尤其是文化历史学家的较为平静的挑战,他们的论点都导致了认识论的相对论。无论如何,只有很少数的历史工作者同意后现代主义者关于“不存在客观标准”的观点,但后现代主义和文化马克思主义的某些中心思想却对日益向文化史转变的社会历史作品产生了很大影响。统一的思想或历史倾向让路给了向小单位、地方和边缘的集中关注,与之同时则是政治史研究地位的下降。在通向21世纪的世纪交替时期,我们已经看到了广泛的研究方法的多元化。 相似文献