全文获取类型
收费全文 | 8421篇 |
免费 | 132篇 |
国内免费 | 1篇 |
专业分类
管理学 | 1139篇 |
民族学 | 29篇 |
人口学 | 729篇 |
丛书文集 | 31篇 |
理论方法论 | 713篇 |
综合类 | 136篇 |
社会学 | 3824篇 |
统计学 | 1953篇 |
出版年
2020年 | 121篇 |
2019年 | 178篇 |
2018年 | 178篇 |
2017年 | 266篇 |
2016年 | 188篇 |
2015年 | 162篇 |
2014年 | 188篇 |
2013年 | 1550篇 |
2012年 | 255篇 |
2011年 | 206篇 |
2010年 | 191篇 |
2009年 | 169篇 |
2008年 | 226篇 |
2007年 | 230篇 |
2006年 | 197篇 |
2005年 | 170篇 |
2004年 | 149篇 |
2003年 | 136篇 |
2002年 | 157篇 |
2001年 | 191篇 |
2000年 | 169篇 |
1999年 | 150篇 |
1998年 | 131篇 |
1997年 | 131篇 |
1996年 | 131篇 |
1995年 | 110篇 |
1994年 | 83篇 |
1993年 | 127篇 |
1992年 | 140篇 |
1991年 | 122篇 |
1990年 | 132篇 |
1989年 | 109篇 |
1988年 | 106篇 |
1987年 | 113篇 |
1986年 | 100篇 |
1985年 | 87篇 |
1984年 | 121篇 |
1983年 | 101篇 |
1982年 | 95篇 |
1981年 | 64篇 |
1980年 | 93篇 |
1979年 | 108篇 |
1978年 | 72篇 |
1977年 | 82篇 |
1976年 | 70篇 |
1975年 | 85篇 |
1974年 | 70篇 |
1973年 | 54篇 |
1972年 | 62篇 |
1971年 | 52篇 |
排序方式: 共有8554条查询结果,搜索用时 15 毫秒
201.
AbstractThis article is devoted to study the problem of test of periodicity in the restricted exponential autoregressive (EXPAR) model. The local asymptotic normality property, of this model, is shown via the adapted sufficient conditions due to Swensen (1985). Using this result, in the case where the innovation density is specified, we obtain a parametric local asymptotic “most stringent” test. 相似文献
202.
ABSTRACTConsider a two-sampling scheme in which an initial sample is first taken from the underlying population and then by assuming a suitable restriction on this sample, some more data points are observed as a new restricted sample. This sampling scheme is used to do inference about the lower quantiles of the underlying distribution. The results are compared with those of simple random sampling in view of mean squared error and Pitman’s measure of closeness criteria for exponential and uniform distributions. It will be shown that the proposed sampling scheme would improve the performance of the point estimators of the lower quantiles of the population. 相似文献
203.
AbstractIn this paper we establish Kolmogrov–Feller weak law of large numbers for maximal weighted sums of i.i.d. random variables. 相似文献
204.
205.
G.H. Brown 《统计学通讯:理论与方法》2013,42(1):57-64
A two sample cest is proposea ior Liie hypuLiiefexo in.; LUSL observations from a second sample are equivalent, in distribution, to the smallest of r independent realisations of the first sample. Assuming H to be true the efficiency of parameter estimation for the exponential and normal distributions is then considered 相似文献
206.
In sequential pattern analysis, the frequency of patterns is evaluated by the support. While computed efficiently from large databases, we show that the support cannot be compared between different databases, since it is influenced by the actual sequence length distribution. Models for this sequence length distribution are surveyed. One of these models, the Good distribution, appears to be sufficiently flexible for practice. It is used to exemplify an approach for adjusting the relative support such that the resulting adjusted support values are better comparable between different databases. We illustrate our findings with texts from the bilingual FinDe corpus. 相似文献
207.
Paul H. Whitfield 《统计学通讯:模拟与计算》2013,42(10):3008-3030
ABSTRACTIn a changing climate, changes in timing of seasonal events such as floods and flowering should be assessed using circular methods. Six different methods for clustering on a circle and one linear method are compared across different locations, spreads, and sample sizes. Best results are obtained when clusters are well separated and the number of observations in each cluster is approximately equal. Simulations of flood-like distributions are used to assess and explore clustering methods. Generally, k-means provides results that are close to the expected results, some other methods perform well under specific conditions, but no single method is exemplary. 相似文献
208.
AbstractGenerating function-based statistical inference is an attractive approach if the probability (density) function is complicated when compared with the generating function. Here, we propose a parameter estimation method that minimizes a probability generating function (pgf)-based power divergence with a tuning parameter to mitigate the impact of data contamination. The proposed estimator is linked to the M-estimators and hence possesses the properties of consistency and asymptotic normality. In terms of parameter biases and mean squared errors from simulations, the proposed estimation method performs better for smaller value of the tuning parameter as data contamination percentage increases. 相似文献
209.
Emad Ashtari Nezhad G. R. Mohtashami Borzadaran H. R. Nilli Sani Hadi Alizadeh Noughabi 《统计学通讯:模拟与计算》2013,42(10):2877-2897
AbstractIn time series, it is essential to check the independence of data by means of a proper method or an appropriate statistical test before any further analysis. Therefore, among different independence tests, a powerful and productive test has been introduced by Matilla-García and Marín via m-dimensional vectorial process, in which the value of the process at time t includes m-histories of the primary process. However, this method causes a dependency for the vectors even when the independence assumption of random variables is considered. Considering this dependency, a modified test is obtained in this article through presenting a new asymptotic distribution based on weighted chi-square random variables. Also, some other alterations to the test have been made via bootstrap method and by controlling the overlap. Compared with the primary test, it is obtained that not only the modified test is more accurate but also, it possesses higher power. 相似文献
210.
T. H. Starks 《统计学通讯:模拟与计算》2013,42(5):603-617
The use of the logit transformation on paired-comparison data in the weighted least squares analysis of response surfaces for aesthetic qualities of products is discussed. Monte Carlo simulations are employed to investigate the small sample properties of the estimators and test statistics. A secondary objective of the Monte Carlo simulations is the comparison of two transformation procedures. The simulations are of standard-item paired-compar-ison experiments in which ties are not allowed. 相似文献