全文获取类型
收费全文 | 16563篇 |
免费 | 795篇 |
国内免费 | 176篇 |
专业分类
管理学 | 205篇 |
劳动科学 | 2篇 |
民族学 | 162篇 |
人才学 | 2篇 |
人口学 | 330篇 |
丛书文集 | 1857篇 |
理论方法论 | 1583篇 |
综合类 | 10209篇 |
社会学 | 1919篇 |
统计学 | 1265篇 |
出版年
2024年 | 43篇 |
2023年 | 161篇 |
2022年 | 136篇 |
2021年 | 218篇 |
2020年 | 307篇 |
2019年 | 377篇 |
2018年 | 377篇 |
2017年 | 423篇 |
2016年 | 409篇 |
2015年 | 459篇 |
2014年 | 1299篇 |
2013年 | 1988篇 |
2012年 | 1523篇 |
2011年 | 1328篇 |
2010年 | 1174篇 |
2009年 | 1020篇 |
2008年 | 989篇 |
2007年 | 843篇 |
2006年 | 782篇 |
2005年 | 685篇 |
2004年 | 747篇 |
2003年 | 727篇 |
2002年 | 586篇 |
2001年 | 403篇 |
2000年 | 257篇 |
1999年 | 58篇 |
1998年 | 38篇 |
1997年 | 35篇 |
1996年 | 19篇 |
1995年 | 21篇 |
1994年 | 15篇 |
1993年 | 16篇 |
1992年 | 9篇 |
1991年 | 4篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1988年 | 5篇 |
1986年 | 4篇 |
1985年 | 5篇 |
1984年 | 8篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 9篇 |
1980年 | 3篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
In this paper, a hypothesis test for heteroscedasticity is proposed in a nonparametric regression model. The test statistic, which uses the residuals from a nonparametric fit of the mean function, is based on an adaptation of the well-known Levene's test. Using the recent theory for analysis of variance when the number of factor levels goes to infinity, the asymptotic distribution of the test statistic is established under the null hypothesis of homocedasticity and under local alternatives. Simulations suggest that the proposed test performs well in several situations, especially when the variance is a nonlinear function of the predictor. 相似文献
83.
This study is a replication of Sundberg and Sundberg (1990) that compared topography-based verbal behavior with selection-based verbal behavior in terms of acquisition, accuracy, and testing for the emergence of a new verbal relation. Participants were three typical children and three developmentally disabled persons with autism. The study sought to determine which paradigm (topography-based or selection-based) resulted in more rapid acquisition of tacts and intraverbals, which was associated with the fewest errors, and which paradigm resulted in the emergence of the highest number of new verbal relations. The results of the study showed that the six participants performed quite differently from one another. Most importantly, the results from the person with autism contradicted previous findings favoring selection-based verbal behavior over topography-based approaches for teaching verbal behavior to low-functioning individuals. 相似文献
84.
本文从"夺取奖牌"、"关注奥运"和"奥林匹克精神"三个方面探讨了北京市民的奥运金牌期待。年龄、学历、收入、职业和户籍等五个因素对不同人群的奥运金牌期待有显著影响。最后,作者从爱国主义、生活场域及人际沟通等三个方面对不同群体的奥运金牌期待特点作出了解释。 相似文献
85.
北平辅仁大学作为一所私立天主教大学,在北平沦陷之后弦歌不辍,讲诵如恒,并得以发展。学校师生与日伪周旋,抗敌不屈,延续民族文化生命,抵制日伪奴化教育,因此赢得了"抗日大本营"的赞誉。 相似文献
86.
Jrn Schulz Jan Terje Kvaly Kjersti Engan Trygve Eftestl Samwel Jatosh Hussein Kidanto Hege Ersdal 《Journal of applied statistics》2020,47(11):1915
This article considers the analysis of complex monitored health data, where often one or several signals are reflecting the current health status that can be represented by a finite number of states, in addition to a set of covariates. In particular, we consider a novel application of a non-parametric state intensity regression method in order to study time-dependent effects of covariates on the state transition intensities. The method can handle baseline, time varying as well as dynamic covariates. Because of the non-parametric nature, the method can handle different data types and challenges under minimal assumptions. If the signal that is reflecting the current health status is of continuous nature, we propose the application of a weighted median and a hysteresis filter as data pre-processing steps in order to facilitate robust analysis. In intensity regression, covariates can be aggregated by a suitable functional form over a time history window. We propose to study the estimated cumulative regression parameters for different choices of the time history window in order to investigate short- and long-term effects of the given covariates. The proposed framework is discussed and applied to resuscitation data of newborns collected in Tanzania. 相似文献
87.
In this paper, we develop Bayes factor based testing procedures for the presence of a correlation or a partial correlation. The proposed Bayesian tests are obtained by restricting the class of the alternative hypotheses to maximize the probability of rejecting the null hypothesis when the Bayes factor is larger than a specified threshold. It turns out that they depend simply on the frequentist t-statistics with the associated critical values and can thus be easily calculated by using a spreadsheet in Excel and in fact by just adding one more step after one has performed the frequentist correlation tests. In addition, they are able to yield an identical decision with the frequentist paradigm, provided that the evidence threshold of the Bayesian tests is determined by the significance level of the frequentist paradigm. We illustrate the performance of the proposed procedures through simulated and real-data examples. 相似文献
88.
89.
理清农民工作回报期望的影响因素进而精准施策,对于破解城乡发展不平衡和满足农民对美好生活的向往意义重大。利用Multinomial Logistic模型和CGSS2015相关数据的实证研究结论发现:以主观社会经济地位和外出务工经历为代表的主观感知性因素是影响农民工作回报期望的关键,而以养老责任和未成年子女数量为代表的客观责任因素的影响则不显著。同时,受教育程度也是影响农民工作回报期望的重要因素,受教育程度为初中及以下的农民对生理回报和安全回报有更强烈的诉求。 相似文献
90.
《Women and birth : journal of the Australian College of Midwives》2020,33(3):294-299
BackgroundThe prevalence of high body mass index is increasing amongst women of child bearing age. High maternal body mass index has ramifications for both mother and baby including increased health risks from gestational diabetes mellitus, caesarean section and stillbirth. Despite the increasing prevalence of high maternal body mass index little is known of the experiences of these women regarding nutrition information access and use during the antenatal period.MethodsA qualitative study using individual interviews was undertaken at a tertiary hospital in south-eastern Australia. Twenty-Eight women with a body mass index ≥30 kg/m2 participated. Interviews were audio recorded, transcribed, cross-checked for consistency and entered into a word processing document for further scrutiny. Data was analysed using interpretative phenomenological analysis (IPA). In any phenomenological study the researcher’s objective is to elicit the participant’s views on their lived experiences.FindingsThree major themes emerged: (1) Nutrition-related information attainment; (2) Nutrition-related information management; (3) Nutrition-related information needs and wants.ConclusionThe findings from this study may assist the future development and dissemination of nutrition-related information for pregnant women with a high body mass index. Women want more individualised support regarding nutritional requirements during pregnancy. 相似文献