全文获取类型
收费全文 | 6379篇 |
免费 | 287篇 |
国内免费 | 112篇 |
专业分类
管理学 | 392篇 |
民族学 | 13篇 |
人才学 | 1篇 |
人口学 | 111篇 |
丛书文集 | 240篇 |
理论方法论 | 126篇 |
综合类 | 1527篇 |
社会学 | 326篇 |
统计学 | 4042篇 |
出版年
2024年 | 14篇 |
2023年 | 89篇 |
2022年 | 114篇 |
2021年 | 140篇 |
2020年 | 175篇 |
2019年 | 277篇 |
2018年 | 322篇 |
2017年 | 414篇 |
2016年 | 272篇 |
2015年 | 233篇 |
2014年 | 319篇 |
2013年 | 1235篇 |
2012年 | 436篇 |
2011年 | 259篇 |
2010年 | 224篇 |
2009年 | 230篇 |
2008年 | 249篇 |
2007年 | 253篇 |
2006年 | 217篇 |
2005年 | 219篇 |
2004年 | 194篇 |
2003年 | 144篇 |
2002年 | 109篇 |
2001年 | 124篇 |
2000年 | 100篇 |
1999年 | 68篇 |
1998年 | 70篇 |
1997年 | 50篇 |
1996年 | 30篇 |
1995年 | 35篇 |
1994年 | 27篇 |
1993年 | 18篇 |
1992年 | 22篇 |
1991年 | 13篇 |
1990年 | 11篇 |
1989年 | 7篇 |
1988年 | 10篇 |
1987年 | 10篇 |
1986年 | 11篇 |
1985年 | 7篇 |
1984年 | 9篇 |
1983年 | 9篇 |
1982年 | 1篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
排序方式: 共有6778条查询结果,搜索用时 15 毫秒
981.
Wavelet analysis is a new mathematical method developed as a unified field of science over the last decade or so. As a spatially adaptive analytic tool, wavelets are useful for capturing serial correlation where the spectrum has peaks or kinks, as can arise from persistent dependence, seasonality, and other kinds of periodicity. This paper proposes a new class of generally applicable wavelet‐based tests for serial correlation of unknown form in the estimated residuals of a panel regression model, where error components can be one‐way or two‐way, individual and time effects can be fixed or random, and regressors may contain lagged dependent variables or deterministic/stochastic trending variables. Our tests are applicable to unbalanced heterogenous panel data. They have a convenient null limit N(0,1) distribution. No formulation of an alternative model is required, and our tests are consistent against serial correlation of unknown form even in the presence of substantial inhomogeneity in serial correlation across individuals. This is in contrast to existing serial correlation tests for panel models, which ignore inhomogeneity in serial correlation across individuals by assuming a common alternative, and thus have no power against the alternatives where the average of serial correlations among individuals is close to zero. We propose and justify a data‐driven method to choose the smoothing parameter—the finest scale in wavelet spectral estimation, making the tests completely operational in practice. The data‐driven finest scale automatically converges to zero under the null hypothesis of no serial correlation and diverges to infinity as the sample size increases under the alternative, ensuring the consistency of our tests. Simulation shows that our tests perform well in small and finite samples relative to some existing tests. 相似文献
982.
This paper develops a new methodology that makes use of the factor structure of large dimensional panels to understand the nature of nonstationarity in the data. We refer to it as PANIC—Panel Analysis of Nonstationarity in Idiosyncratic and Common components. PANIC can detect whether the nonstationarity in a series is pervasive, or variable‐specific, or both. It can determine the number of independent stochastic trends driving the common factors. PANIC also permits valid pooling of individual statistics and thus panel tests can be constructed. A distinctive feature of PANIC is that it tests the unobserved components of the data instead of the observed series. The key to PANIC is consistent estimation of the space spanned by the unobserved common factors and the idiosyncratic errors without knowing a priori whether these are stationary or integrated processes. We provide a rigorous theory for estimation and inference and show that the tests have good finite sample properties. 相似文献
983.
随着信息传播技术的飞速发展,网络问卷调查业已成为相对主流的调查研究方法之一,被众多行业调研机构者和学术研究人员所采用。在简要介绍了网络问卷调查的发展历史及在我国的发展现状之后,通过参与式观察,我们剖析了国内网络问卷调查中存在的两大问题,即数据质量和个人信息安全,以期引起社会的关注和反思,针对这些问题,最后试图提出可行性解决方案,以期推动网络问卷调查行业的良性发展。 相似文献
984.
介绍了一个适用于高校教材管理领域的网络信息系统,并对其总体结构及工作流程作了进一步探讨。 相似文献
985.
Laurent Bordes 《Scandinavian Journal of Statistics》1999,26(3):345-361
In this paper we investigate the asymptotic properties of estimators obtained for the semiparametric additive accelerated life model proposed by Bagdonavicius & Nikulin (1995). This model generalizes the well known additive hazards model of survival analysis and is close to the general transformation model (see Dabrowska & Doksum, 1988). Asymptotic properties of the estimator of the regression parameter and the estimator of the reliability function are given in the case of right censoring for discretized data and a numerical example illustrates these results. 相似文献
986.
Asymptotic Minimax Risk for the White Noise Model on the Sphere 总被引:1,自引:0,他引:1
Jussi Klemela 《Scandinavian Journal of Statistics》1999,26(3):465-473
Estimation of an unknown function on the unit sphere of the Euclidean space is considered. The function is observed in Gaussian continuous time white noise. Uniform norm is chosen as a loss function and exact asymptotic minimax risk is derived extending the result of Korostelev (1993). The exact asymptotic minimax risk is also given for the L 2 -loss, applying the result of Pinsker (1980). 相似文献
987.
M. Yang H. Goldstein & A. Heath 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》1999,163(1):49-62
Models for fitting longitudinal binary responses are explored by using a panel study of voting intentions. A standard multilevel repeated measures logistic model is shown to be inadequate owing to a substantial proportion of respondents who maintain a constant response over time. A multivariate binary response model is shown to be a better fit to the data. 相似文献
988.
介绍了一种基于ARM微处理器的嵌入式GPRS工业控制远程数据采集系统的设计与实现。硬件系统采用高性能S3C2410嵌入式系统作为数据采集控制节点,GPRS模块采用内置TCP/IP协议的MC35作为无线数据传输单元,结合嵌入式Linux操作系统,保证了数据传输的实时性和可靠性。论述了系统软硬件实现的关键技术。 相似文献
989.
This paper analyzes the linear regression model y = xβ+ε with a conditional median assumption med (ε| z) = 0, where z is a vector of exogenous instrument random variables. We study inference on the parameter β when y is censored and x is endogenous. We treat the censored model as a model with interval observation on an outcome, thus obtaining an incomplete model with inequality restrictions on conditional median regressions. We analyze the identified features of the model and provide sufficient conditions for point identification of the parameter β. We use a minimum distance estimator to consistently estimate the identified features of the model. We show that under point identification conditions and additional regularity conditions, the estimator based on inequality restrictions is normal and we derive its asymptotic variance. One can use our setup to treat the identification and estimation of endogenous linear median regression models with no censoring. A Monte Carlo analysis illustrates our estimator in the censored and the uncensored case. 相似文献
990.
Javier Alvarez Manuel Arellano 《Econometrica : journal of the Econometric Society》2003,71(4):1121-1159
In this paper we derive the asymptotic properties of within groups (WG), GMM, and LIML estimators for an autoregressive model with random effects when both T and N tend to infinity. GMM and LIML are consistent and asymptotically equivalent to the WG estimator. When T/N→ 0 the fixed T results for GMM and LIML remain valid, but WG, although consistent, has an asymptotic bias in its asymptotic distribution. When T/N tends to a positive constant, the WG, GMM, and LIML estimators exhibit negative asymptotic biases of order 1/T, 1/N, and 1/(2N−T), respectively. In addition, the crude GMM estimator that neglects the autocorrelation in first differenced errors is inconsistent as T/N→c>0, despite being consistent for fixed T. Finally, we discuss the properties of a random effects pseudo MLE with unrestricted initial conditions when both T and N tend to infinity. 相似文献