全文获取类型
收费全文 | 2107篇 |
免费 | 151篇 |
国内免费 | 18篇 |
专业分类
管理学 | 241篇 |
民族学 | 1篇 |
人口学 | 68篇 |
丛书文集 | 55篇 |
理论方法论 | 101篇 |
综合类 | 416篇 |
社会学 | 226篇 |
统计学 | 1168篇 |
出版年
2023年 | 14篇 |
2022年 | 16篇 |
2021年 | 40篇 |
2020年 | 44篇 |
2019年 | 71篇 |
2018年 | 75篇 |
2017年 | 64篇 |
2016年 | 73篇 |
2015年 | 76篇 |
2014年 | 124篇 |
2013年 | 223篇 |
2012年 | 114篇 |
2011年 | 148篇 |
2010年 | 81篇 |
2009年 | 142篇 |
2008年 | 115篇 |
2007年 | 140篇 |
2006年 | 48篇 |
2005年 | 48篇 |
2004年 | 43篇 |
2003年 | 32篇 |
2002年 | 39篇 |
2001年 | 35篇 |
2000年 | 23篇 |
1999年 | 8篇 |
1998年 | 10篇 |
1997年 | 15篇 |
1996年 | 11篇 |
1995年 | 33篇 |
1994年 | 19篇 |
1993年 | 3篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 46篇 |
1984年 | 54篇 |
1983年 | 56篇 |
1982年 | 48篇 |
1981年 | 36篇 |
1980年 | 33篇 |
1979年 | 25篇 |
1978年 | 37篇 |
1977年 | 4篇 |
排序方式: 共有2276条查询结果,搜索用时 953 毫秒
251.
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
252.
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
253.
Marilena Barnabei 《Journal of statistical planning and inference》1979,3(3):279-286
In the present paper we start the study of arcs with weighted points in a finite projective plane, and we get some particular results about the existence or non-existence of these arcs. 相似文献
254.
Let X be a discrete random variable the set of possible values (finite or infinite) of which can be arranged as an increasing sequence of real numbers a1<a2<a3<…. In particular, ai could be equal to i for all i. Let X1n≦X2n≦?≦Xnn denote the order statistics in a random sample of size n drawn from the distribution of X, where n is a fixed integer ≧2. Then, we show that for some arbitrary fixed k(2≦k≦n), independence of the event {Xkn=X1n} and X1n is equivalent to X being either degenerate or geometric. We also show that the montonicity in i of P{Xkn = X1n | X1n = ai} is equivalent to X having the IFR (DFR) property. Let ai = i and . We prove that the independence of {X2n ? X1n ∈B} and X1n for all i is equivalent to X being geometric, where B = {m} (B = {m,m+1,…}), provided G(i) = qi?1, 1≦i≦m+2 (1≦i≦m+1), where 0<q<1. 相似文献
255.
Ching-Shui Cheng 《Journal of statistical planning and inference》1979,3(2):109-118
Youden hyperrectangles are higher-dimensional generalizations of balanced block designs and generalized Youden designs. This kind of design has been shown to be optimal for the elimination of multi-way heterogeneity. In this paper, patchwork and geometric methods are combined to construct Youden hyperrectangles for many parameter values. 相似文献
256.
Charles F. Doran 《Journal of Policy Modeling》1979,1(3):413-424
Collapse of the Shah's regime has transformed Iran's attitude regarding oil production policy. The nature of OPEC leadership is changing as well. Three models examine the nature of this leadership inside OPEC: (1) the conventional price leadership model, (2) a model emphasizing a concept of egalitarian leadership, and (3) a team model composed of coalitions. The three models establish the limits within which OPEC leadership is exercised. A composite model drawing upon all three sets of results suggests that Saudi Arabia shapes cartel policy not by itself, but through a dominant coalition of states. For most of the period 1969–1978 this coalition has been stable. Following the unsettling changes of 1973, cooptation of Iran into the dominant coalition in 1974 was an important step in achieving a new level of stability. But during the turbulence of regime transformation in Iran, the nature of the governing coalition appears to have changed. One consequence may be that in the future Saudi Arabia will yield more willingly to arguments heard within OPEC on behalf of upwards price pressure, especially in an atmosphere of growing political isolation and overall tight supply. 相似文献
257.
Arnie Berckmans Françoise Thys-Clément Denise Van Regemorter Jozef Vuchelen 《Journal of Policy Modeling》1984,6(1):45-67
This article analyzes the effects of debt management and its consequence for the control of base money in a small open economy (Belgium). The study compares the effects obtained from a small theoretical model with the results of a larger empirical model.The theoretical model focuses on the financing of government by money operation, on the bond rate, and on the international reserve of the Central Bank.The empirical model is a medium-term one, including the demand and the supply sectors of the economy and permitting simultaneous analysis of real and financial variables.The effects of an endogeneous or exogenous debt management have been studied by numerical simulation of modification in the public expenditure, the world trade, and the discount rate. 相似文献
258.
Rasul A. Khan 《Journal of statistical planning and inference》1984,9(2):199-206
A subfamily of exponential distributions is considered and it is shown that the variance of the UMVU estimator of an estimable function g(θ) having power series expansion is the limit of Bhattacharya bounds. 相似文献
259.
It is shown that the minimal covering designs for v=6t+5 treatments in blocks of size 3 are optimal w.r.t. a large class of optimality criteria. This class of optimality criteria includes the well-known criteria of A-, D- and E-optimality. It is conjectured that these designs are also optimal w.r.t. other criteria suggested by Takeuchi (1961). 相似文献
260.
Judah Rosenblatt D.L. Jackson W.P. Dole W.L. Thompson 《Journal of statistical planning and inference》1983,8(3):281-300
In this paper the accuracy of the normal approximation to the Poisson is treated from the viewpoint of direct approximation of Poisson variables by normal ones. The conclusions that are derived on the accuracy of this approximation lead (among others) to very useful results on confidence limits for the mean of a linear combination of independent Poisson variables; these latter are employed in precise determination of the composition of a mixture of radioactive isotopes by means of a scintillation counter. 相似文献