全文获取类型
收费全文 | 5327篇 |
免费 | 136篇 |
国内免费 | 55篇 |
专业分类
管理学 | 400篇 |
民族学 | 11篇 |
人才学 | 6篇 |
人口学 | 26篇 |
丛书文集 | 355篇 |
理论方法论 | 62篇 |
综合类 | 3151篇 |
社会学 | 219篇 |
统计学 | 1288篇 |
出版年
2024年 | 8篇 |
2023年 | 47篇 |
2022年 | 18篇 |
2021年 | 59篇 |
2020年 | 72篇 |
2019年 | 88篇 |
2018年 | 121篇 |
2017年 | 171篇 |
2016年 | 106篇 |
2015年 | 154篇 |
2014年 | 245篇 |
2013年 | 693篇 |
2012年 | 335篇 |
2011年 | 370篇 |
2010年 | 286篇 |
2009年 | 306篇 |
2008年 | 316篇 |
2007年 | 321篇 |
2006年 | 288篇 |
2005年 | 289篇 |
2004年 | 222篇 |
2003年 | 224篇 |
2002年 | 201篇 |
2001年 | 167篇 |
2000年 | 107篇 |
1999年 | 52篇 |
1998年 | 34篇 |
1997年 | 35篇 |
1996年 | 23篇 |
1995年 | 15篇 |
1994年 | 20篇 |
1993年 | 12篇 |
1992年 | 15篇 |
1991年 | 10篇 |
1990年 | 8篇 |
1989年 | 9篇 |
1988年 | 5篇 |
1987年 | 10篇 |
1986年 | 3篇 |
1985年 | 15篇 |
1984年 | 15篇 |
1983年 | 7篇 |
1982年 | 7篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1977年 | 5篇 |
排序方式: 共有5518条查询结果,搜索用时 15 毫秒
51.
Three parameters—sample size, sampling intervals, and the control limits—must be determined when the x bar chart to monitor a manufacturing process. The constant sampling intervals were widely employed because of its administrative simplicity. However, the variable sampling interval (VSI) has recently been shown to give substantially faster detection of most process shifts than fixed-sampling-interval (FSI) for x-bar charts. In addition, these measurements in the subgroup are assumed to be normally distributed. That assumption may not be tenable. This investigation compares the economic design of x-bar control charts for non normal data under Weibull shock models with various sampling avenues. 相似文献
52.
Change-over designs with independently distributed errors in the model have been studied extensively in the literature. Martin and Eccleston (2001) gave an algorithm for the generation of efficient change-over designs when the errors are correlated. This article proposes an algorithm for the generation of efficient change-over designs for estimation of direct effects of treatments in the presence of first-order residual effects in the model and when the errors are correlated. 相似文献
53.
In a response-adaptive design, we review and update the trial on the basis of outcomes in order to achive a specific goal. In clinical trials our goal is to allocate a larger number of patients to the better treatment. In the present paper, we use a response adaptive design in a two-treatment two-period crossover trial where the treatment responses are continuous. We provide probability measures to choose between the possible treatment combinations AA, AB, BA, or BB. The goal is to use the better treatment combination a larger number of times. We calculate the allocation proportions to the possible treatment combinations and their standard errors. We also derive some asymptotic results and provide solutions on related inferential problems. The proposed procedure is compared with a possible competitor. Finally, we use a data set to illustrate the applicability of our proposed design. 相似文献
54.
Yibing Oliver Chen 《统计学通讯:理论与方法》2013,42(12):2473-2506
In this article, we consider experimental situations where a blocked regular two-level fractional factorial initial design is used. We investigate the use of the semi-fold technique as a follow-up strategy for de-aliasing effects that are confounded in the initial design as well as an alternative method for constructing blocked fractional factorial designs. A construction method is suggested based on the full foldover technique and sufficient conditions are obtained when the semi-fold yields as many estimable effects as the full foldover. 相似文献
55.
AbstractThis paper searches for A-optimal designs for Kronecker product and additive regression models when the errors are heteroscedastic. Sufficient conditions are given so that A-optimal designs for the multifactor models can be built from A-optimal designs for their sub-models with a single factor. The results of an efficiency study carried out to check the adequacy of the products of optimal designs for uni-factor marginal models when these are used to estimate different multi-factor models are also reported. 相似文献
56.
ABSTRACTThis paper presents systematic methods of construction of optimal block designs for a double cross experiments for both even and odd values of “p” parental lines. The both even and odd values of designs are derived by using initial block of unreduced balanced incomplete block designs and initial block of row–column designs given by Bose et al. (1953) and Gupta and Choi (1998), respectively. In this attempt we have found some new universally optimal block designs for double cross experiments. 相似文献
57.
S. Sengupta 《统计学通讯:理论与方法》2013,42(19):5745-5750
ABSTRACTLet P be the proportion of individuals in a finite population possessing a sensitive attribute. We consider the problem of unbiased estimation of (i) the variance of a linear unbiased estimator of P and (ii) the population variance P (1—P) for a given probability sampling design under Warner's (1965) randomized response (RR) plan when independent responses are obtained from each sampled individual as many times as he/she is selected in the sample and prove the admissibility of a quadratic unbiased estimator for each. 相似文献
58.
ABSTRACTEconomic statistical designs aim at minimizing the cost of process monitoring when a specific scenario or a set of estimated process and cost parameters is given. But, in practice the process may be affected by more than one scenario which may lead to severe cost penalties if the wrong design is used. Here, we investigate the robust economic statistical design (RESD) of the T2 chart in an attempt to reduce these cost penalties when there are multiple scenarios. Our method is to employ the genetic algorithm (GA) optimization method to minimize the total expected monitoring cost across all distinct scenarios. We illustrate the effectiveness of the method using two numerical examples. Simulation studies indicate that robust economic statistical designs should be encouraged in practice. 相似文献
59.
60.
Wilfrido J. Paredes-García 《统计学通讯:理论与方法》2013,42(23):5877-5888
AbstractIn choice experiments the process of decision-making can be more complex than the proposed by the Multinomial Logit Model (MNL). In these scenarios, models such as the Nested Multinomial Logit Model (NMNL) are often employed to model a more complex decision-making. Understanding the decision-making process is important in some fields such as marketing. Achieving a precise estimation of the models is crucial to the understanding of this process. To do this, optimal experimental designs are required. To construct an optimal design, information matrix is key. A previous research by others has developed the expression for the information matrix of the two-level NMNL model with two nests: Alternatives nest (J alternatives) and No-Choice nest (1 alternative). In this paper, we developed the likelihood function for a two-stage NMNL model for M nests and we present the expression for the information matrix for 2 nests with any amount of alternatives in them. We also show alternative D-optimal designs for No-Choice scenarios with similar relative efficiency but with less complex alternatives which can help to obtain more reliable answers and one application of these designs. 相似文献