全文获取类型
收费全文 | 1638篇 |
免费 | 30篇 |
国内免费 | 8篇 |
专业分类
管理学 | 52篇 |
劳动科学 | 1篇 |
民族学 | 4篇 |
人口学 | 18篇 |
丛书文集 | 55篇 |
理论方法论 | 12篇 |
综合类 | 380篇 |
社会学 | 6篇 |
统计学 | 1148篇 |
出版年
2023年 | 6篇 |
2022年 | 9篇 |
2021年 | 12篇 |
2020年 | 23篇 |
2019年 | 49篇 |
2018年 | 59篇 |
2017年 | 87篇 |
2016年 | 43篇 |
2015年 | 39篇 |
2014年 | 55篇 |
2013年 | 483篇 |
2012年 | 120篇 |
2011年 | 64篇 |
2010年 | 50篇 |
2009年 | 41篇 |
2008年 | 49篇 |
2007年 | 55篇 |
2006年 | 46篇 |
2005年 | 42篇 |
2004年 | 36篇 |
2003年 | 29篇 |
2002年 | 33篇 |
2001年 | 38篇 |
2000年 | 30篇 |
1999年 | 18篇 |
1998年 | 26篇 |
1997年 | 13篇 |
1996年 | 14篇 |
1995年 | 13篇 |
1994年 | 7篇 |
1993年 | 11篇 |
1992年 | 11篇 |
1991年 | 6篇 |
1990年 | 10篇 |
1989年 | 3篇 |
1988年 | 8篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 7篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1980年 | 7篇 |
1979年 | 3篇 |
1978年 | 4篇 |
1976年 | 1篇 |
排序方式: 共有1676条查询结果,搜索用时 15 毫秒
61.
Mostafa S. Aminzadeh 《统计学通讯:理论与方法》2013,42(1):343-353
A method for obtaining prediction intervals for an outcome of a future experiment is presented. The method uses hypothesis testing as a tool to derive prediction intervals and assumes that the probability distributions of informative and future experiments are one parameter exponential families. Asymptotic similar mean coverage prediction intervals are derived using the score test as a test statistics. Examples are presented and asymptotic prediction limits are compared with the prediction limits given in the literature. 相似文献
62.
Some improved ratio type estimators of population mean and ratio in finite population sample surveys
B. Prasad 《统计学通讯:理论与方法》2013,42(1):379-392
In this paper we present a class of ratio type estimators of the population mean and ratio in a finite population sample surveys with without replacement simple random sampling design, where information on an auxiliary variate x positively correlated with the main variate y is available. Large sample approximations to mean square errors (MSE) of these estimatorsare evaluated and their MSE's are compared with the MSE of the usual ratio estimator [ybar]R of [ybar] the population mean of y. It is shown that under certain conditions these estimators are more efficient than [ybar]R. When a prior knowledge of the value of thecoefficient of variation, cy, of y is at hand, ratio type estimator, say [ybar]1 of [ybar] is proposed. It is shown, under certain conditions, that [ybar]1 is more efficient than [ybar]R. When values of cy, cx and the population correlation coefficient ρ is at hand, then we have proposed another estimator, say [ybar]2 of [ybar], which is always better than [ybar]R as far as the efficiency is concerned. In fact, is [ybar] 2 is shown to be even better than [ybar]1. Finally estimators better than the usual ratio estimator [ybar]/[xbar] of [Ybar] are given. 相似文献
63.
Dayanand N. Naik 《统计学通讯:理论与方法》2013,42(6):2315-2321
Extensions of recent results for detection of mean slippage type outliers from i.i.d. multivariate normal and elliptically symmetric distributions are made to symmetric case, that is, when the observations are equicorrelated. The main tool used is Wijsman's (1967) representation theorem. The results obtained can be viewed as a robustness property of the use of Mardia's multivariate kurtosis as a locally optimal test statistic to detect outliers against equicorrelated distributions. 相似文献
64.
The problem of estimation of a cumulative distribution function (cdf), bounded by two known cdf's, is considered. An estimator satisfying the desired restriction has been obtained by suitably adjusting the empirical cdf. Consistency of the adjusted estimator has been established and its mean square error (MSE) has been shown to be smallerthan that of the empirical cdf. The new estimator has been comparedwith the empirical cdf for some special cases. 相似文献
65.
The relative 'performances of improved ridge estimators and an empirical Bayes estimator are studied by means of Monte Carlo simulations. The empirical Bayes method is seen to perform consistently better in terms of smaller MSE and more accurate empirical coverage than any of the estimators considered here. A bootstrap method is proposed to obtain more reliable estimates of the MSE of ridge esimators. Some theorems on the bootstrap for the ridge estimators are also given and they are used to provide an analytical understanding of the proposed bootstrap procedure. Empirical coverages of the ridge estimators based on the proposed procedure are generally closer to the nominal coverage when compared to their earlier counterparts. In general, except for a few cases, these coverages are still less accurate than the empirical coverages of the empirical Bayes estimator. 相似文献
66.
D. B. Holiday 《统计学通讯:理论与方法》2013,42(8):2387-2406
Nonparametric smoothing, such as kernel or spline estimation, has been examined extensively under the assumption of uncorrelated errors. This paper addresses the effects of potential correlation on consistency and other asymptotic properties in a repeated-measures model, using directly optimized linear smoothers of the replicate means. Unrestricted optimal weights, with respect to squared error loss, are used to confirm a lack of consistency for all linear estimators in an autocorrelated errors model. The results indicate kernel methods that work well for an uncorrelated errors model may not have the ability to perform satisfactorily when correlation is introduced, due to an asymmetry in the optimal weights, which disappears for an uncorrelated errors model. These would include data-driven bandwidth selection methods, adjustments of the bandwidth to accommodate correlation, higher-order kernels, and related bias reduction techniques. The analytic results suggest alternative approaches, not considered here in detail, which have shown merit. 相似文献
67.
68.
Alexandras A. Arabatzis Timothy G. Gregoire Marion R. Reynolds Jr 《统计学通讯:理论与方法》2013,42(12):4359-4373
The effect of rejecting a two-sided preliminary test of significance for the mean of a normal distribution upon subsequent interval estimation of the mean is examined. For the case where the variance is known, conditional confidence intervals may be shorter than unconditional intervals, in contrast to the one-sided preliminary test case examined by Meeks and D’Agostino (1983, The American Statistician, 7, 134-136) . For the case where the variance is unknown and must be estimated by the sample variance, it is shown that customary intervals do not offer uniformly greater or lesser coverage than the nominal level. 相似文献
69.
Assume independent random samples are drawn from two populations which are exponentially distributed with unknown location parameters and a common known scale parameter. We want to estimate the maximum and the minimum of the unknowo location paremeters. In this paper several estimators are proposed which are better than the natural estimations in terms of absolute bias and /or meaqn squared error. 相似文献
70.
This paper considers an improvement of the customary estimator of a finite population mean under a single stage sampling design when paired data, are available on each unit of the sample. Guided by the well known problem of “corninon mean”, a mixture i.e. a weighted combination of the mean of the principal characteristic and that of the auxiliary (possibly transformed) characteristic is proposed. It is shown that, under some conditions, improveinent (with respect to MSE) over the traditional estimator is possible for a broad range of the values of the mixing constant. An estimator of the MSE of the proposed estimator is also provided. 相似文献