全文获取类型
收费全文 | 1347篇 |
免费 | 53篇 |
专业分类
管理学 | 150篇 |
民族学 | 9篇 |
人口学 | 86篇 |
丛书文集 | 6篇 |
理论方法论 | 123篇 |
综合类 | 3篇 |
社会学 | 806篇 |
统计学 | 217篇 |
出版年
2023年 | 13篇 |
2022年 | 5篇 |
2021年 | 12篇 |
2020年 | 33篇 |
2019年 | 39篇 |
2018年 | 32篇 |
2017年 | 59篇 |
2016年 | 42篇 |
2015年 | 25篇 |
2014年 | 37篇 |
2013年 | 239篇 |
2012年 | 58篇 |
2011年 | 48篇 |
2010年 | 48篇 |
2009年 | 37篇 |
2008年 | 42篇 |
2007年 | 52篇 |
2006年 | 47篇 |
2005年 | 46篇 |
2004年 | 54篇 |
2003年 | 36篇 |
2002年 | 28篇 |
2001年 | 33篇 |
2000年 | 24篇 |
1999年 | 24篇 |
1998年 | 17篇 |
1997年 | 17篇 |
1996年 | 21篇 |
1995年 | 14篇 |
1994年 | 9篇 |
1993年 | 15篇 |
1992年 | 11篇 |
1991年 | 17篇 |
1990年 | 13篇 |
1989年 | 8篇 |
1988年 | 16篇 |
1987年 | 12篇 |
1986年 | 18篇 |
1985年 | 12篇 |
1984年 | 11篇 |
1983年 | 14篇 |
1982年 | 11篇 |
1981年 | 5篇 |
1980年 | 7篇 |
1979年 | 7篇 |
1978年 | 5篇 |
1976年 | 5篇 |
1975年 | 4篇 |
1974年 | 4篇 |
1971年 | 3篇 |
排序方式: 共有1400条查询结果,搜索用时 31 毫秒
81.
Steven Martin 《Demography》2009,46(1):203-208
This analysis joins the debate on how declines in marriage have shifted the composition of the unmarried and married populations
in the United States, and how compositional shifts have affected nonmarital birth rates. Gray, Stockard, and Stone (2006)
presented one model for compositional effects that Ermisch (2009) challenged with alternative statistical tests. I propose
an alternative model for compositional shifts based not on theory but on observed marriage and fertility patterns. The results
from this alternative model are consistent with Ermisch’s findings yet support Gray et al.’s general case that compositional
effects have had an important infiuence on nonmarital birth rates. 相似文献
82.
83.
In recent years, population health research has focused on understanding the determinants of later-life health. Two strands of that work have focused on (1) international comparisons of later-life health and (2) assessing the early-life origins of disease and disability and the importance of life course processes. However, the less frequently examined intersection of these approaches remains an important frontier. The present study contributes to the integration of these approaches. We use the Health and Retirement Study family of data sets and a cohort dynamic approach to compare functional health trajectories across 12 high-income countries and to examine the role of life course processes and cohort dynamics in contributing to variation in those trajectories. We find substantial international variation in functional health trajectories and an important role of cohort dynamics in generating that variation, with younger cohorts often less healthy at comparable ages than the older cohorts they are replacing. We further find evidence of heterogeneous effects of life course processes on health trajectories. The results have important implications for future trends in morbidity and mortality as well as public policy. 相似文献
84.
Steven M. Harris Sarah A. Crabtree Natasha K. Bell Sarah M. Allen Kelly M. Roberts 《Journal of divorce & remarriage》2017,58(2):83-95
There is a well-established literature dedicated to why couples divorce, transitions associated with divorce, and the impact of divorce on families. However, little is known about the divorce decision-making process. We conducted in-depth interviews with individuals who have recently considered divorce (n = 30) and asked specifically about the roles of 2 concepts in their decision-making process: clarity and confidence. Three major themes emerged from the data: (a) Clarity about a decision to divorce or stay married is desired, it fluctuates, and takes time to find; (b) pivotal moments can bring clarity; and (c) confidence (in the final decision) is desired. Clinical implications and directions for future research are discussed. 相似文献
85.
Using ethnographic and interview data, this article explores hopes for the future of young Indonesian musicians. The young people are seen to consider their future trajectories in multiple, hierarchical music fields. The article also takes into account the ontological insecurity of jobs as a professional musician, arguing that there is continuous reproduction of a doxa, namely ‘survival of the fittest’ in Indonesia. Yet despite abundant risks to livelihoods, young Indonesian musicians expressed optimistic views about the future. The analysis of data below bridges the gap between the traditionally separate youth studies fields of youth transitions and youth cultures. Our interpretation critically contextualises the dialogue between these two fields based on the experiences of young Indonesian musicians as a part of the Global South. 相似文献
86.
High-content automated imaging platforms allow the multiplexing of several targets simultaneously to generate multi-parametric single-cell data sets over extended periods of time. Typically, standard simple measures such as mean value of all cells at every time point are calculated to summarize the temporal process, resulting in loss of time dynamics of the single cells. Multiple experiments are performed but observation time points are not necessarily identical, leading to difficulties when integrating summary measures from different experiments. We used functional data analysis to analyze continuous curve data, where the temporal process of a response variable for each single cell can be described using a smooth curve. This allows analyses to be performed on continuous functions, rather than on original discrete data points. Functional regression models were applied to determine common temporal characteristics of a set of single cell curves and random effects were employed in the models to explain variation between experiments. The aim of the multiplexing approach is to simultaneously analyze the effect of a large number of compounds in comparison to control to discriminate between their mode of action. Functional principal component analysis based on T-statistic curves for pairwise comparison to control was used to study time-dependent compound effects. 相似文献
87.
We present a time-domain goodness-of-fit (gof) diagnostic test that is based on signal-extraction variances for nonstationary time series. This diagnostic test extends the time-domain gof statistic of Maravall (2003) by taking into account the effects of model parameter uncertainty, utilizing theoretical results of McElroy and Holan (2009). We demonstrate that omitting this correction results in a severely undersized statistic. Adequate size and power are obtained in Monte Carlo studies for fairly short time series (10 to 15 years of monthly data). Our Monte Carlo studies of finite sample size and power consider different combinations of both signal and noise components using seasonal, trend, and irregular component models obtained via canonical decomposition. Details of the implementation appropriate for SARIMA models are given. We apply the gof diagnostic test statistics to several U.S. Census Bureau time series. The results generally corroborate the output of the automatic model selection procedure of the X-12-ARIMA software, which in contrast to our diagnostic test statistic does not involve hypothesis testing. We conclude that these diagnostic test statistics are a useful supplementary model-checking tool for practitioners engaged in the task of model-based seasonal adjustment. 相似文献
88.
Matthew S. Rutledge Steven A. Sass Jorge D. Ramos-Mercado 《Journal of Labor Research》2017,38(3):283-305
To assess the employment opportunities of older job-changers in the years prior to retirement, this study examines the how the breadth of occupations in which they find employment narrows as they age past their prime working years and how this differs by gender and educational attainment. The results indicate that workers who change jobs in their early 50s find employment in a reasonably similar set of occupations as prime-age workers, with opportunities narrowing at older ages. They also indicate that job opportunities broadened significantly for better-educated older workers since the late 1990s. While job opportunities now narrow significantly for less-educated men in their late 50s, this narrowing primarily occurs in the early 60s for women and better-educated men. In contrast to previous research, the study finds that employer policies that emphasize hiring from within are less important barriers to the hiring of older job-seekers. The study also finds that the narrowing of job opportunities is associated with a general decline in job quality as measured by median occupational earnings, a decline associated with differences in occupational skill requirements and the underlying economic environment. These results suggest that older hiring is not as limited to a select few occupations as it had been in previous decades, and that policy reforms aimed at increasing opportunities and improving labor market fluidity might best be served if they focused on less-educated men. 相似文献
89.
Cline Hoeks Hossein Azadi Parisa Rafiaani Khachak Enrique Troyo‐Dieguez Steven Van Passel Frank Witlox 《Development policy review : the journal of the Overseas Development Institute》2014,32(6):647-674
Given the historical development of land tenure in South Africa, the aim of this article is to examine the best routes to alleviate poverty and retain sustainable agriculture in the country. First, a theoretical framework is presented that relates land tenure to sustainability, and three historical periods (pre‐colonial, colonial, and apartheid) are then considered to explain the changes in land tenure and their consequences. The progress and main limitations of post‐apartheid land reform to approach agricultural sustainability and alleviate poverty are discussed. Based on the analysis, different possibilities for future land reform are elaborated, followed by some recommendations for future land‐reform policies in South Africa. 相似文献
90.
- Use multiple informants.
- Children can provide useful information.
- Comprehensive abuse risk assessment.