全文获取类型
收费全文 | 1594篇 |
免费 | 26篇 |
专业分类
管理学 | 253篇 |
民族学 | 9篇 |
人才学 | 2篇 |
人口学 | 130篇 |
丛书文集 | 12篇 |
理论方法论 | 147篇 |
综合类 | 20篇 |
社会学 | 890篇 |
统计学 | 157篇 |
出版年
2023年 | 7篇 |
2020年 | 25篇 |
2019年 | 20篇 |
2018年 | 25篇 |
2017年 | 45篇 |
2016年 | 29篇 |
2015年 | 22篇 |
2014年 | 39篇 |
2013年 | 249篇 |
2012年 | 42篇 |
2011年 | 48篇 |
2010年 | 44篇 |
2009年 | 37篇 |
2008年 | 60篇 |
2007年 | 43篇 |
2006年 | 41篇 |
2005年 | 43篇 |
2004年 | 56篇 |
2003年 | 38篇 |
2002年 | 55篇 |
2001年 | 21篇 |
2000年 | 27篇 |
1999年 | 38篇 |
1998年 | 26篇 |
1997年 | 20篇 |
1996年 | 23篇 |
1995年 | 21篇 |
1994年 | 24篇 |
1993年 | 21篇 |
1992年 | 22篇 |
1991年 | 23篇 |
1990年 | 29篇 |
1989年 | 23篇 |
1988年 | 27篇 |
1987年 | 19篇 |
1986年 | 27篇 |
1985年 | 18篇 |
1984年 | 15篇 |
1983年 | 23篇 |
1982年 | 14篇 |
1981年 | 24篇 |
1980年 | 18篇 |
1979年 | 20篇 |
1978年 | 13篇 |
1977年 | 14篇 |
1976年 | 19篇 |
1975年 | 16篇 |
1974年 | 11篇 |
1971年 | 6篇 |
1970年 | 8篇 |
排序方式: 共有1620条查询结果,搜索用时 0 毫秒
31.
This article investigates the choice of working covariance structures in the analysis of spatially correlated observations motivated by cardiac imaging data. Through Monte Carlo simulations, we found that the choice of covariance structure affects the efficiency of the estimator and power of the test. Choosing the popular unstructured working covariance structure results in an over-inflated Type I error possibly due to a sample size not large enough relative to the number of parameters being estimated. With regard to model fit indices, Bayesian Information Criterion outperforms Akaike Information Criterion in choosing the correct covariance structure used to generate data. 相似文献
32.
Joshua N. Sampson Charles E. Matthews Laurence S. Freedman Raymond J. Carroll Victor Kipnis 《Journal of applied statistics》2016,43(9):1706-1721
Sedentary behavior has already been associated with mortality, cardiovascular disease, and cancer. Questionnaires are an affordable tool for measuring sedentary behavior in large epidemiological studies. Here, we introduce and evaluate two statistical methods for quantifying measurement error in questionnaires. Accurate estimates are needed for assessing questionnaire quality. The two methods would be applied to validation studies that measure a sedentary behavior by both questionnaire and accelerometer on multiple days. The first method fits a reduced model by assuming the accelerometer is without error, while the second method fits a more complete model that allows both measures to have error. Because accelerometers tend to be highly accurate, we show that ignoring the accelerometer's measurement error, can result in more accurate estimates of measurement error in some scenarios. In this article, we derive asymptotic approximations for the mean-squared error of the estimated parameters from both methods, evaluate their dependence on study design and behavior characteristics, and offer an R package so investigators can make an informed choice between the two methods. We demonstrate the difference between the two methods in a recent validation study comparing previous day recalls to an accelerometer-based ActivPal. 相似文献
33.
This paper explores the ways in which the work-life balance choices made by heterosexual couples differ in different generations, how such choices are gendered, and the extent to which 'individualization' provides an adequate conceptualization of the effects of social change on heterosexual couples. It argues that processes of individualization need to be seen in the context of changing social institutions, and that it is the de-institutionalization of 'the family' and the life course that is leading to a de-gendering of work-life balance choices. The paper draws on findings from a restudy of the family and social change and a study of the gender dimensions of job insecurity both of which were carried out in the same geographical location. The studies provide evidence of generational change in work-life balance choices and increasing occupational differentiation between heterosexual partners. This leads to a situation where increasingly choices are made which blur gendered boundaries and which has been made possible by a process of de-institutionalization of the male breadwinner family. Our findings support the contention that processes of individualization are more apparent amongst younger than older generations and that, because of changes external to the family, there is more negotiation and pragmatism amongst younger generations about work-life choices. 相似文献
34.
Walker CA Curry LC Hogstel MO 《Journal of psychosocial nursing and mental health services》2007,45(1):38-45
Relocation stress syndrome is a nursing diagnosis characterized by symptoms such as anxiety, confusion, hopelessness, and loneliness. It usually occurs in older adults shortly after moving from a private residence to a nursing home or assisted-living facility. The primary purpose of this study was to validate the symptoms of relocation stress syndrome. Eight nursing home residents and 8 assisted-living facility residents were interviewed 2 to 10 weeks after admission, when symptoms of relocation stress syndrome are most likely to appear. Results of this study indicate that the incidence of relocation stress syndrome may be overestimated. More accurate diagnosis and treatment of depression in older adults is needed. 相似文献
35.
Charles R. Schwenk 《决策科学》1984,15(4):449-462
Critics of previous laboratory experiments comparing devil's advocacy (DA) to dialectical inquiry (DI) have suggested that these experiments produced misleading results because (1) they used subjects who had low levels of task involvement and (2) the DI treatment used was confusing to subjects and required further explanation to be useful. The present study examines the effects of four inquiry methods—expert (E), DA, DI, and DI with explanatory statement (DI+)—on subjects' performance at a financial prediction task. Results show that DA, DI, and DI + were superior to E when the state of the world differed significantly from assumptions underlying the expert's plan. For subjects with high task involvement, DI and DI + were more effective than E and DA. The results support some of the criticisms of previous laboratory research and suggest that future research on these decision aids should include task involvement as a factor. 相似文献
36.
Implications of a probabilistic “random walk” model of incremental sales response to advertising are developed for various timing patterns of advertising expenditures. Maximum likelihood procedures for assessing advertising effectiveness and for estimating a decay (forgetting) rate are developed and applied to artificial data of known configuration and are used to assess the impact over time of a brochure program on mail-order sales. Results are also compared to those from alternative models involving various lag patterns in advertising effects. 相似文献
37.
Xue Feng Charles I. Mosimah Gina Sizemore Rashmi Goyat 《Journal Of Human Behavior In The Social Environment》2019,29(1):26-36
ABSTRACTThere are substantial gaps in research on Health Related Quality of Life (HRQoL) in students aged 18 and above in West Virginia. The purpose of this study is to explore the associations between mindful self-care, perceived stress, and the HRQoL in this population. We conducted a cross-sectional study between March and April 2017. We included participants who were students, aged 18 years and above, living in West Virginia and were able to answer online questions in English. Data was obtained from an online survey using a structured questionnaire, including the SF12v2®, mindful self-care scale- SHORT, and Perceived Stress Scale (PSS)-10. We applied linear regressions to determine the predictors of HRQoL (physical health and mental health) using SF12v2®. 194 participants met the inclusion criteria of the study. Mindful self-care was negatively associated with perceived stress. Better mindful self-care mediated the relationship between perceived stress and psychological well-being, controlling for gender, age, race, marital status, education level, annual household income, and chronic disease status. Perceived stress and mindful self-care were not related to the physical well-being. Better mindful self-care may safeguard against perceived stress among students aged 18 years and above. Our findings in this study recommend more mindfulness-based interventions targeted to this subpopulation to improve psychological well-being. 相似文献
38.
Harvey Charles Peters 《Journal of LGBT Issues in Counseling》2018,12(1):2-16
This article provides a review of the literature addressing the unique needs and experiences of queer fathers. Despite the growing number of queer fathers and families, and increasing scholarship on this topic, there is a major dearth in the counseling scholarship and practice related to queer families, or more specifically and especially, queer fatherhood. Thus, this article uses the concept of a “protective circle” to assist professional counselors to understand their vital role within a queer father and familial system. By understanding the experiences and needs of queer fathers, counselors can better conceptualize and assist this underserved and often silenced community. 相似文献
39.
Charles Crothers 《The American Sociologist》2016,47(4):486-498
Journals may set themselves one or several of a range of missions, but often a national Sociology Association’s journal is concerned to be a vehicle assisting in the shaping of that country’s ‘national sociology’, while maintaining some openness to international sociology. This personalised case study of New Zealand’s sociology journal discusses the extent to which this mission has been achieved over the last decade and more generally over the journal’s history, and the nitty-gritty of challenges and operational issues involved in carrying this out. 相似文献
40.
Previous experimental research on asset markets has reported that the level of cash available to traders does not affect asset prices when fundamentals follow a time trajectory that is constant over time. This contrasts with other research indicating that greater cash levels increase prices when fundamental values are decreasing over time. We report a new experiment in which we show that greater initial cash levels are indeed associated with higher prices when fundamental values are constant over time. Thus, high cash levels will lead to bubbles, if the cash is introduced before the market opens. Our results reconcile the two previous sets of findings. (JEL C90, D03, G02, G12) 相似文献