全文获取类型
收费全文 | 5820篇 |
免费 | 171篇 |
专业分类
管理学 | 878篇 |
民族学 | 33篇 |
人才学 | 2篇 |
人口学 | 559篇 |
丛书文集 | 37篇 |
理论方法论 | 707篇 |
综合类 | 52篇 |
社会学 | 2985篇 |
统计学 | 738篇 |
出版年
2023年 | 24篇 |
2020年 | 92篇 |
2019年 | 115篇 |
2018年 | 97篇 |
2017年 | 140篇 |
2016年 | 149篇 |
2015年 | 108篇 |
2014年 | 148篇 |
2013年 | 991篇 |
2012年 | 181篇 |
2011年 | 161篇 |
2010年 | 135篇 |
2009年 | 155篇 |
2008年 | 172篇 |
2007年 | 166篇 |
2006年 | 153篇 |
2005年 | 197篇 |
2004年 | 214篇 |
2003年 | 184篇 |
2002年 | 195篇 |
2001年 | 150篇 |
2000年 | 117篇 |
1999年 | 131篇 |
1998年 | 113篇 |
1997年 | 101篇 |
1996年 | 89篇 |
1995年 | 96篇 |
1994年 | 90篇 |
1993年 | 100篇 |
1992年 | 74篇 |
1991年 | 85篇 |
1990年 | 64篇 |
1989年 | 61篇 |
1988年 | 69篇 |
1987年 | 50篇 |
1986年 | 53篇 |
1985年 | 63篇 |
1984年 | 57篇 |
1983年 | 56篇 |
1982年 | 60篇 |
1981年 | 51篇 |
1980年 | 48篇 |
1979年 | 49篇 |
1978年 | 44篇 |
1977年 | 46篇 |
1976年 | 44篇 |
1975年 | 45篇 |
1974年 | 33篇 |
1973年 | 29篇 |
1971年 | 22篇 |
排序方式: 共有5991条查询结果,搜索用时 93 毫秒
851.
John H.J. Einmahl 《统计学通讯:理论与方法》2013,42(4):813-822
The asymptotic distribution of the sup-norm of the heavily weighted empirical process is established in the multidimensional case. This theorem extends in particular the famous result in Jaeschke (1975, 1979) to higher dimensions. There is a striking difference between the behaviour for higher dimensions and that for dimension one, especially the limiting distribution is now a simple transformation of a standard exponential random variable. 相似文献
852.
In this article, we analyze the indexation of federal taxes, using an approach based on cost-of-living measurement. We use our Tax and Price Index methodology and data base to study an indexed system historically, comparing indexation with the Consumer Price Index (CPI) to actual tax policy, a tax system with constant parameters, and an “exact” indexing scheme. We reach three main conclusions: (a) The sequence of tax reductions implemented between 1967 and 1985 have fallen short of mimicking indexation, (b) wealthier households would have benefited relatively more than lower-income households from indexation, and (c) CPI indexation would not have completely eliminated bracket creep. 相似文献
853.
We develop a model of labor force status (federal employment, nonfederal employment, unemployment, and out of the labor force) that depends on human capital variables, local labor market conditions, and personal characteristics. According to the estimated model for white non-Hispanic males and females a substantial difference exists between blacks and white non-Hispanics even after correction for the control variables. However, the control variables explain almost all of the difference between Hispanics and white non-Hispanics. 相似文献
854.
John J. Miller 《商业与经济统计学杂志》2013,31(2):123-125
This article provides new tools for the evaluation of dynamic stochastic general equilibrium (DSGE) models and applies them to a large-scale new Keynesian model. We approximate the DSGE model by a vector autoregression, and then systematically relax the implied cross-equation restrictions and document how the model fit changes. We also compare the DSGE model's impulse responses to structural shocks with those obtained after relaxing its restrictions. We find that the degree of misspecification in this large-scale DSGE model is no longer so large as to prevent its use in day-to-day policy analysis, yet is not small enough to be ignored. 相似文献
855.
The article develops a semiparametric estimation method for the bivariate count data regression model. We develop a series expansion approach in which dependence between count variables is introduced by means of stochastically related unobserved heterogeneity components, and in which, unlike existing commonly used models, positive as well as negative correlations are allowed. Extensions that accommodate excess zeros, censored data, and multivariate generalizations are also given. Monte Carlo experiments and an empirical application to tobacco use confirms that the model performs well relative to existing bivariate models, in terms of various statistical criteria and in capturing the range of correlation among dependent variables. This article has supplementary materials online. 相似文献
856.
An efficient optimization algorithm for identifying the best least squares regression model under the condition of non-negative coefficients is proposed. The algorithm exposits an innovative solution via the unrestricted least squares and is based on the regression tree and branch-and-bound techniques for computing the best subset regression. The aim is to filling a gap in computationally tractable solutions to the non-negative least squares problem and model selection. The proposed method is illustrated with a real dataset. Experimental results on real and artificial random datasets confirm the computational efficacy of the new strategy and demonstrates its ability to solve large model selection problems that are subject to non-negativity constrains. 相似文献
857.
We propose an algorithm to estimate the unknown constants in a multiple linear regression model under the minimum sum of weighted absolute errors (MSWAE). The proposed algorithm, a generalization of an earlier algorithm, is compared to a bounded variable algorithm. Some somputational experience is reported. 相似文献
858.
Conditional confidence intervals for the location parameter of the double exponential distribution based on maximum likelihood estimators conditioned on a set of ancillary statistics and the corresponding unconditional confidence intervals based on the maximum likelihood estimators alone are compared in two ways. Monte Carlo techniques are used and the conditional approach appears to give slightly better results although agreement as n becomes larger is noted 相似文献
859.
Effects of censoring on the robustness of exponential-based confidence intervals for median lifetime
John D. Emerson 《统计学通讯:模拟与计算》2013,42(6):617-627
Statistical procedures for constructing confidence intervals for median lifetime often rest on a distributional assumption for failure times.This paper explores the interplay between censoring levels and robustness for two construction procedures based on exponential lifetime, subject to general right-censoring. Data are simulated from nearby Weibull distributions. As expected, the simulations indicate that when the exponential assumption is not satisfied, observed coverage by the confidence intervals may differ substantially from the specified coverage level. The marked improvement in the robustness properties of the intervals as the level of censoring increases suggests questions for future research. 相似文献
860.
John L. Maryak 《统计学通讯:模拟与计算》2013,42(4):1117-1121
As pointed out in a recent paper by Amirkhalkhali and Rao (1986) (henceforth referred to as A&R), the usual assumption of normality for the error terms of a regression model isoften untenable. However, when this assumption is dropped, it may be difficult to characterize parameter estimates for the model. For example, A&R (p. 189) state that “if the regression errors are non-normal, we are not even sure of their [e.g., the generalized least squares parameter estimates1] asymptotic properties.” A partial answer, however, is given by Spall and Wall (1984), which presents an asymptotic distribution theory for Kalman filter estimates for cases where the random terms of the state space model are not necessarily Gaussian. Certain of these asymptotic distribution results are also discussed in Spall (1985) in the context of model validation (diagnostic checking) 相似文献