全文获取类型
收费全文 | 818篇 |
免费 | 8篇 |
国内免费 | 2篇 |
专业分类
管理学 | 10篇 |
人口学 | 4篇 |
理论方法论 | 1篇 |
综合类 | 1篇 |
社会学 | 1篇 |
统计学 | 811篇 |
出版年
2022年 | 3篇 |
2021年 | 2篇 |
2020年 | 13篇 |
2019年 | 24篇 |
2018年 | 24篇 |
2017年 | 45篇 |
2016年 | 14篇 |
2015年 | 12篇 |
2014年 | 19篇 |
2013年 | 373篇 |
2012年 | 67篇 |
2011年 | 19篇 |
2010年 | 23篇 |
2009年 | 24篇 |
2008年 | 15篇 |
2007年 | 13篇 |
2006年 | 6篇 |
2005年 | 14篇 |
2004年 | 14篇 |
2003年 | 10篇 |
2002年 | 7篇 |
2001年 | 13篇 |
2000年 | 7篇 |
1999年 | 8篇 |
1998年 | 8篇 |
1997年 | 5篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 5篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有828条查询结果,搜索用时 15 毫秒
81.
We consider the problem of testing the equality of two population means when the population variances are not necessarily equal. We propose a Welch-type statistic, say T* c, based on Tiku!s ‘1967, 1980’ modified maximum likelihood estimators, and show that this statistic is robust to symmetric and moderately skew distributions. We investigate the power properties of the statistic T* c; T* c clearly seems to be more powerful than Yuen's ‘1974’ Welch-type robust statistic based on the trimmed sample means and the matching sample variances. We show that the analogous statistics based on the ‘adaptive’ robust estimators give misleading Type I errors. We generalize the results to testing linear contrasts among k population means 相似文献
82.
There are many time series applications where an experimenter observes the simultaneous responses of several subsystems over time. In these instances one is often not interested in the parameters of individual subsystems, but rather in an overall characterization of the system in question. Under the assumption that subsystems are independent and first order autoregressive, the present paper presents two methods for estimating the distribution of the subsystem coefficients. 相似文献
83.
《The American statistician》2013,67(3):256-261
Frequency tables are often constructed on intervals of irregular width. When plotted as bar charts, the underlying true density information may be quite distorted. The majority of introductory statistics texts recommend tabulating data into intervals of equal width, but seldom caution the consequences of failing to do so. An occasional introductory text correctly emphasizes that area rather than frequency should be plotted. Nevertheless, the correctly scaled density figure is often visually less informative than one might expect, with wide bins at constant height. In many cases, the right most bin interval has no well-defined end point, making its depiction some what arbitrary. In this note, we introduce a regular histogram approximation that matches the frequencies and also minimizes a roughness criterion for visual and exploratory appeal. The resulting estimate can reveal the density structure much more clearly. We also formulate an alternative criterion that explicitly takes account of the uncertainty in the bin frequencies. 相似文献
84.
Abstract. The asymptotic behaviour of several goodness-of-fit statistics for copula families is obtained under contiguous alternatives. Many comparisons between a Cramér–von Mises functional of the empirical copula process and new moment-based goodness-of-fit statistics are made by considering their associated asymptotic local power curves. It is shown that the choice of the estimator for the unknown parameter can have a significant influence on the power of the Cramér–von Mises test and that some of the moment-based statistics can provide simple and efficient goodness-of-fit methods. 相似文献
85.
The present article deals with the problem of estimation of parameters in a linear regression model when some data on response
variable is missing and the responses are equi-correlated. The ordinary least squares and optimal homogeneous predictors are
employed to find the imputed values of missing observations. Their efficiency properties are analyzed using the small disturbances
asymptotic theory. The estimation of regression coefficients using these imputed values is also considered and a comparison
of estimators is presented. 相似文献
86.
Provincial Conditional Income Convergence in China, 1953-1997: A Panel Data Approach 总被引:5,自引:0,他引:5
This paper examines the tendency towards income convergence among China's main provinces during the two periods: the pre-reform period 1953-1977 and the reform period 1978-1997 using the framework of the Solow growth model. The panel data method accounts for not only province-specific initial technology level but also the heterogeneity of the technological progress rate between the fast-growing coastal and interior provinces. Estimation problems of weak instruments and endogeneity are addressed by the use of a system generalized method of moments (GMM) estimator. The main empirical finding is that there is a system-wide income divergence during the reform period because the coastal provinces do not share a common technology progress rate with the interior provinces. 相似文献
87.
i
, i = 1, 2, ..., k be k independent exponential populations with different unknown location parameters θ
i
, i = 1, 2, ..., k and common known scale parameter σ. Let Y
i
denote the smallest observation based on a random sample of size n from the i-th population. Suppose a subset of the given k population is selected using the subset selection procedure according to which the population π
i
is selected iff Y
i
≥Y
(1)−d, where Y
(1) is the largest of the Y
i
's and d is some suitable constant. The estimation of the location parameters associated with the selected populations is considered
for the squared error loss. It is observed that the natural estimator dominates the unbiased estimator. It is also shown that
the natural estimator itself is inadmissible and a class of improved estimators that dominate the natural estimator is obtained.
The improved estimators are consistent and their risks are shown to be O(kn
−2). As a special case, we obtain the coresponding results for the estimation of θ(1), the parameter associated with Y
(1).
Received: January 6, 1998; revised version: July 11, 2000 相似文献
88.
Adam W. Kolkiewicz 《Revue canadienne de statistique》2003,31(3):329-347
The author shows how to find M‐estimators of location whose generating function is monotone and which are optimal or close to optimal. It is easy to identify a consistent sequence of estimators in this class. In addition, it contains simple and efficient approximations in cases where the likelihood function is difficult to obtain. In some neighbourhoods of the normal distribution, the loss of efficiency due to the approximation is quite small. Optimal monotone M‐estimators can also be determined in cases when the underlying distribution is known only up to a certain neighbourhood. The author considers the e‐contamination model and an extension thereof that allows the distributions to be arbitrary outside compact intervals. His results also have implications for distributions with monotone score functions. The author illustrates his methodology using Student and stable distributions. 相似文献
89.
Sometimes, in industrial quality control experiments and destructive stress testing, only values smaller than all previous ones are observed. Here we consider nonparametric quantile estimation, both the ‘sample quantile function’ and kernel-type estimators, from such record-breaking data. For a single record-breaking sample, consistent estimation is not possible except in the extreme tails of the distribution. Hence replication is required, and for m. such independent record-breaking samples the quantile estimators are shown to be strongly consistent and asymptotically normal as m-→∞. Also, for small m, the mean-squared errors, biases and smoothing parameters (for the smoothed estimators) are investigated through computer simulations. 相似文献
90.
This paper generalizes the tolerance interval approach for assessing agreement between two methods of continuous measurement for repeated measurement data—a common scenario in applications. The repeated measurements may be longitudinal or they may be replicates of the same underlying measurement. Our approach is to first model the data using a mixed model and then construct a relevant asymptotic tolerance interval (or band) for the distribution of appropriately defined differences. We present the methodology in the general context of a mixed model that can incorporate covariates, heteroscedasticity and serial correlation in the errors. Simulation for the no-covariate case shows good small-sample performance of the proposed methodology. For the longitudinal data, we also describe an extension for the case when the observed time profiles are modelled nonparametrically through penalized splines. Two real data applications are presented. 相似文献