全文获取类型
收费全文 | 3333篇 |
免费 | 125篇 |
专业分类
管理学 | 562篇 |
民族学 | 15篇 |
人才学 | 1篇 |
人口学 | 230篇 |
丛书文集 | 26篇 |
理论方法论 | 468篇 |
综合类 | 42篇 |
社会学 | 1532篇 |
统计学 | 582篇 |
出版年
2023年 | 18篇 |
2021年 | 20篇 |
2020年 | 48篇 |
2019年 | 85篇 |
2018年 | 83篇 |
2017年 | 113篇 |
2016年 | 121篇 |
2015年 | 80篇 |
2014年 | 85篇 |
2013年 | 470篇 |
2012年 | 137篇 |
2011年 | 113篇 |
2010年 | 104篇 |
2009年 | 100篇 |
2008年 | 115篇 |
2007年 | 122篇 |
2006年 | 101篇 |
2005年 | 109篇 |
2004年 | 105篇 |
2003年 | 97篇 |
2002年 | 103篇 |
2001年 | 87篇 |
2000年 | 77篇 |
1999年 | 63篇 |
1998年 | 51篇 |
1997年 | 68篇 |
1996年 | 56篇 |
1995年 | 42篇 |
1994年 | 48篇 |
1993年 | 49篇 |
1992年 | 31篇 |
1991年 | 33篇 |
1990年 | 41篇 |
1989年 | 37篇 |
1988年 | 34篇 |
1987年 | 31篇 |
1986年 | 23篇 |
1985年 | 35篇 |
1984年 | 37篇 |
1983年 | 21篇 |
1982年 | 32篇 |
1981年 | 30篇 |
1980年 | 27篇 |
1979年 | 31篇 |
1978年 | 17篇 |
1977年 | 11篇 |
1976年 | 28篇 |
1975年 | 14篇 |
1974年 | 18篇 |
1973年 | 16篇 |
排序方式: 共有3458条查询结果,搜索用时 15 毫秒
91.
Five sampling schemes (SS) for price index construction – one cut-off sampling technique and four probability-proportional-to-size (pps) methods – are evaluated by comparing their performance on a homescan market research data set across 21 months for each of the 13 classification of individual consumption by purpose (COICOP) food groups. Classifications are derived for each of the food groups and the population index value is used as a reference to derive performance error measures, such as root mean squared error, bias and standard deviation for each food type. Repeated samples are taken for each of the pps schemes and the resulting performance error measures analysed using regression of three of the pps schemes to assess the overall effect of SS and COICOP group whilst controlling for sample size, month and population index value. Cut-off sampling appears to perform less well than pps methods and multistage pps seems to have no advantage over its single-stage counterpart. The jackknife resampling technique is also explored as a means of estimating the standard error of the index and compared with the actual results from repeated sampling. 相似文献
92.
There are a number of statistical techniques for analysing epidemic outbreaks. However, many diseases are endemic within populations and the analysis of such diseases are complicated by changing population demography. Motivated by the spread of cowpox among rodent populations, a combined mathematical model for population and disease dynamics is introduced. An MCMC algorithm is then constructed to make statistical inference for the model based on data being obtained from a capture–recapture experiment. The statistical analysis is used to identify the key elements in the spread of the cowpox virus. 相似文献
93.
In the Bayesian analysis of a multiple-recapture census, different diffuse prior distributions can lead to markedly different inferences about the population size N. Through consideration of the Fisher information matrix it is shown that the number of captures in each sample typically provides little information about N. This suggests that if there is no prior information about capture probabilities, then knowledge of just the sample sizes and not the number of recaptures should leave the distribution of Nunchanged. A prior model that has this property is identified and the posterior distribution is examined. In particular, asymptotic estimates of the posterior mean and variance are derived. Differences between Bayesian and classical point and interval estimators are illustrated through examples. 相似文献
94.
Narat Charupat Richard Deaves Travis Derouin Marcelo Klotzle Peter Miu 《Theory and Decision》2013,75(1):17-41
We find suggestive evidence that emotional balance has an impact on probability weighting incremental to demographic controls. Specifically, low negative affectivity (implying high emotional balance) tends to be a characteristic of those whose probability weighting functions exhibit lower curvature and more neutral elevation. In other words, emotional balance seems to push people in the direction of normative expected utility theory. 相似文献
95.
Neoclassical economic and sociological views of discrimination are compared. We summarize economic models of taste, statistical, error, and monopolistic discrimination. Economists argue that competitive market forces should lead to the demise of discrimination in the long run. After explaining these arguments, we present sociological arguments about institutional and social‐psychological mechanisms that promote the persistence of discrimination. A typology of social‐psychological feedback effects from discrimination is presented. We conclude that it is important to recognize forces promoting both the erosion and persistence of discrimination and that this requires a perspective drawing upon both sociology and economics. 相似文献
96.
Liangjun Su Zhentao Shi Peter C. B. Phillips 《Econometrica : journal of the Econometric Society》2016,84(6):2215-2264
This paper provides a novel mechanism for identifying and estimating latent group structures in panel data using penalized techniques. We consider both linear and nonlinear models where the regression coefficients are heterogeneous across groups but homogeneous within a group and the group membership is unknown. Two approaches are considered—penalized profile likelihood (PPL) estimation for the general nonlinear models without endogenous regressors, and penalized GMM (PGMM) estimation for linear models with endogeneity. In both cases, we develop a new variant of Lasso called classifier‐Lasso (C‐Lasso) that serves to shrink individual coefficients to the unknown group‐specific coefficients. C‐Lasso achieves simultaneous classification and consistent estimation in a single step and the classification exhibits the desirable property of uniform consistency. For PPL estimation, C‐Lasso also achieves the oracle property so that group‐specific parameter estimators are asymptotically equivalent to infeasible estimators that use individual group identity information. For PGMM estimation, the oracle property of C‐Lasso is preserved in some special cases. Simulations demonstrate good finite‐sample performance of the approach in both classification and estimation. Empirical applications to both linear and nonlinear models are presented. 相似文献
97.
An effective business model is the core enabler of any company's performance. Business model innovation is not only becoming more and more important due to increasing and globalizing competition, but also an enormous challenge, both theoretically and practically. Although many managers are eager to consider more disruptive changes to their business model, they often do not know how to articulate their existing or desired business model and, even less so, understand the possibilities for innovating it. One of the steps toward developing more theoretical insight and practical guidelines is the identification of types and the development of a typology of business model innovations. Ten retrospective case studies of business model innovations undertaken by two industrial companies provide the empirical basis for this article. We analyzed the characteristics of these innovations as well as their success rates. The findings suggest that there are indeed various business model innovation types, each with its own characteristics and challenges. 相似文献
98.
99.
Marcel de Toledo Vieira Maria de Fátima Salgueiro Peter W. F. Smith 《Journal of applied statistics》2016,43(7):1310-1321
We investigate the impacts of complex sampling on point and standard error estimates in latent growth curve modelling of survey data. Methodological issues are illustrated with empirical evidence from the analysis of longitudinal data on life satisfaction trajectories using data from the British Household Panel Survey, a national representative survey in Great Britain. A multi-process second-order latent growth curve model with conditional linear growth is used to study variation in the two perceived life satisfaction latent factors considered. The benefits of accounting for the complex survey design are considered, including obtaining unbiased both point and standard error estimates, and therefore correctly specified confidence intervals and statistical tests. We conclude that, even for the rather elaborated longitudinal data models that were considered, estimation procedures are affected by variance-inflating impacts of complex sampling. 相似文献
100.