全文获取类型
收费全文 | 877篇 |
免费 | 75篇 |
国内免费 | 9篇 |
专业分类
管理学 | 72篇 |
民族学 | 7篇 |
人口学 | 7篇 |
丛书文集 | 35篇 |
理论方法论 | 67篇 |
综合类 | 248篇 |
社会学 | 80篇 |
统计学 | 445篇 |
出版年
2023年 | 4篇 |
2022年 | 8篇 |
2021年 | 19篇 |
2020年 | 15篇 |
2019年 | 40篇 |
2018年 | 45篇 |
2017年 | 22篇 |
2016年 | 32篇 |
2015年 | 32篇 |
2014年 | 37篇 |
2013年 | 97篇 |
2012年 | 44篇 |
2011年 | 71篇 |
2010年 | 53篇 |
2009年 | 75篇 |
2008年 | 60篇 |
2007年 | 58篇 |
2006年 | 27篇 |
2005年 | 19篇 |
2004年 | 16篇 |
2003年 | 12篇 |
2002年 | 9篇 |
2001年 | 13篇 |
2000年 | 33篇 |
1999年 | 5篇 |
1998年 | 1篇 |
1997年 | 7篇 |
1996年 | 5篇 |
1995年 | 11篇 |
1994年 | 9篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1986年 | 1篇 |
1985年 | 6篇 |
1984年 | 17篇 |
1983年 | 11篇 |
1982年 | 14篇 |
1981年 | 6篇 |
1980年 | 10篇 |
1979年 | 4篇 |
1978年 | 10篇 |
排序方式: 共有961条查询结果,搜索用时 31 毫秒
101.
王立勋 《中华女子学院学报》2004,16(6):64-67
随着电信业的发展,以3G为依托的一个巨大产业链已经开始形成,并将推动、促进新的电信市场格局的构建.面对这种形势,电信运营商应当采取有效的竞争策略,主动应对、打好品牌战略、挖掘用户潜在需求、建立有效的监管机制,从而为企业营造一个可持续发展的生态环境. 相似文献
102.
Y.P. Mack 《Journal of statistical planning and inference》1983,8(2):185-192
Let fn(x) be the univariate k-nearest neighbor (k-NN) density estimate proposed by Loftsgaarden and Quesenberry (1965). By using similar techniques as in Bahadur's representation of sample quantiles (1966), and by the recent results on the oscillation of empirical processes by Stute (1982), we derive the rate of strong uniform convergence of fn(x) on some suitably chosen interval Jδ. Some comparison with the kernel estimates is given, as well as the choice of the bandwidth sequence relative to the sample size. 相似文献
103.
Recursive estimates of a probability density function (pdf) are known. This paper presents recursive estimates of a derivative of any desired order of a pdf. Let f be a pdf on the real line and p?0 be any desired integer. Based on a random sample of size n from f, estimators f(p)n of f(p), the pth order derivatives of f, are exhibited. These estimators are of the form , where δjp depends only on p and the jth observation in the sample, and hence can be computed recursively as the sample size increases. These estimators are shown to be asymptotically unbiased, mean square consistent and strongly consistent, both at a point and uniformly on the real line. For pointwise properties, the conditions on f(p) have been weakened with a little stronger assumption on the kernel function. 相似文献
104.
David G. Gil 《Children and youth services review》1984,6(4):299-309
This paper examines consequences for child development and well-being of the prevailing institutional order and ideology of the United States and concludes that child development in our country is severely obstructed because of socially structured violence which permeates our way of life. The paper ends with comments on prospects for social transformation which seems necessary to assure the development and well-being of every child. 相似文献
105.
For testing the hypothesis that several (s?2) linear regression surfaces Xki=αk+βkcki+Zki (k=1,…,s) are parallel to one another, i.e., β1=?=βs, a class of rank-order tests are considered. The tests are shown to be asymptotically distribution-free, and their asymptotic efficiency relative to the general likelihood ratio test is derived. Asymptotic optimality in the sense of Wald is also discussed. 相似文献
106.
We consider the problem of binary-image restoration. The image being restored is not random, and we make no assumption about the nature of its contents. The estimate of the colour at each site is a fixed (the same for all sites) function of the data available in a neighbourhood of that site. Under this restriction, the estimate minimizing the overall mean squared error of prediction is the conditional expectation of the true colour given the observations in the neighbourhood of a site. The computation of this conditional expectation leads to the formal definition of the local characteristics of an image, namely, the frequency with which each pattern appears in the true unobserved image. When the “true” distribution of the patterns is unknown, it can be estimated from the records. The conditional expectation described above can then be evaluated using the estimated distribution of the patterns, and this procedure leads to a very natural estimate of the colour at each site. We propose two unbiased and consistent estimates for the distribution of patterns when the noise is a Gaussian white noise. Since the size of realistic images is very large, the estimated pattern distribution is usually close to the true one. This suggests that the estimated conditional expectation can be expected to be nearly optimal. An interesting feature of the proposed restoration methods is that they do not require prior knowledge of the local or global properties of the true underlying image. Several examples based on synthetic images show that the new methods perform fairly well for a variety of images with different degrees of colour continuity or textures. 相似文献
107.
Vasant P. Bhapkar 《Journal of statistical planning and inference》1984,9(3):285-296
A unified development is offered for asymptotically distribution-free profile analysis of several multivariate samples. This includes as special cases procedures based on generalized U-statistics and also those based on linear rank statistics. Furthermore, it includes as special cases analysis of location profiles and also scalar profiles. Finally, asymptotic power and consistency properties are discussed for tests of hypotheses and subhypotheses of interest. 相似文献
108.
Hira L. Koul 《Revue canadienne de statistique》1978,6(2):249-271
A class of tests is proposed for testing H0 F?(x) = e?λx, λ > 0, x≥0 vs. H1 F?(x + y) ≤ F?(x)F?(y), x, y≥0, with strict inequality for some x, y ≥ 0 (F = new is better than used). Efficiency comparisons of some tests within the class are made and a new test is proposed on the basis of these comparisons. Consistency and the asymptotic normality of the class of tests is proved under fairly broad conditions on the underlying entities. 相似文献
109.
Let Xi≤?≤Xm and Yi≤?≤Yn be two sets of independent order statistics from continous distributions with distribution functions F and G respectively. Let Ri denote the rank of Xi in the combined order sample. Steck (1980) has found an expression for P(bi≤Ri≤ai, all i) when F = h(G), h being the incomplete beta function with parameters (α,β?α+1). An alternative expression for the same probability is obtained which is computationally a substantial improvement on Steck's result. 相似文献
110.
Smiley W. Cheng 《Journal of statistical planning and inference》1980,4(3):259-265
The asymptotically best linear unbiased estimate (ABLUE) of the normal mean is discussed. The estimate is based on k selected order statistics chosen from a singly or doubly censored large sample of size n(>k). The coefficients, the asymptotic relative efficiency of the estimate, and the optimum spacing of k real numbers between 0 and 1 which determines the optimum ranks of order statistics, are provided. A comparison between the ABLUE and the iterated maximum likelihood estimate is made. 相似文献