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排序方式: 共有159条查询结果,搜索用时 15 毫秒
21.
本文给出了等热流条件下热绕流运动密度场的加权残数解,并且在一给定的工况下计算了相应的密度场,所得结果与数值解及实验情况相吻合.该解法具有解析结构清楚、计算工作量小的特点. 相似文献
22.
Recursive residuals and their relationship to the recursive estimation of regression parameters have been developed for unvaried regression mod els. Such residuals and estimates have been used to test the constancy of regression over time. The current paper extends this work to multivariate regression modal. 相似文献
23.
This article proposes a new spatial cluster detection method for longitudinal outcomes that detects neighborhoods and regions with elevated rates of disease while controlling for individual level confounders. The proposed method, CumResPerm, utilizes cumulative geographic residuals through a permutation test to detect potential clusters which are defined as sets of administrative regions, such as a town or group of administrative regions. Previous cluster detection methods are not able to incorporate individual level data including covariate adjustment, while still being able to define potential clusters using informative neighborhood or town boundaries. Often, it is of interest to detect such spatial clusters because individuals residing in a town may have similar environmental exposures or socioeconomic backgrounds due to administrative reasons, such as zoning laws. Therefore, these boundaries can be very informative and more relevant than arbitrary clusters such as the standard circle or square. Application of the CumResPerm method will be illustrated by the Home Allergens and Asthma prospective cohort study analyzing the relationship between area or neighborhood residence and repeated measured outcome, occurrence of wheeze in the last six months, while taking into account mobile locations. 相似文献
24.
Herbert I. Weisberg Samprit Chatterjee Mukul Majumdar Edward L. Melnick Alan J. Oppenheim 《商业与经济统计学杂志》2013,31(2):275-278
The diagnostic tools examined in this article are applicable to regressions estimated with panel data or cross-sectional data drawn from a population with grouped structure. The diagnostic tools considered include (a) tests for the existence of group effects under both fixed and random effects models, (b) checks for outlying groups, and (c) specification tests for comparing the fixed and random effects models. A group-specific counterpart to the studentized residual is introduced. The methods are illustrated using a hedonic housing price regression. 相似文献
25.
In this paper, we propose a method for testing absolutely regular and possibly nonstationary nonlinear time-series, with application to general AR-ARCH models. Our test statistic is based on a marked empirical process of residuals which is shown to converge to a Gaussian process with respect to the Skohorod topology. This testing procedure was first introduced by Stute [Nonparametric model checks for regression, Ann. Statist. 25 (1997), pp. 613–641] and then widely developed by Ngatchou-Wandji [Weak convergence of some marked empirical processes: Application to testing heteroscedasticity, J. Nonparametr. Stat. 14 (2002), pp. 325–339; Checking nonlinear heteroscedastic time series models, J. Statist. Plann. Inference 133 (2005), pp. 33–68; Local power of a Cramer-von Mises type test for parametric autoregressive models of order one, Compt. Math. Appl. 56(4) (2008), pp. 918–929] under more general conditions. Applications to general AR-ARCH models are given. 相似文献
26.
《Journal of Statistical Computation and Simulation》2012,82(7):1427-1443
Residuals are frequently used to evaluate the validity of the assumptions of statistical models and may also be employed as tools for model selection. In this paper, we consider residuals and their limiting properties in the linear mixed measurement error models. Also, we develop types of residuals for these models and then review some of the residual analysis techniques. Further, by using the definition of generalized leverage, we derive generalized leverage matrices for identification of high-leverage points for these models. Finally, we analyse a real data set. 相似文献
27.
The tobit model allows a censored response variable to be described by covariates. Its applications cover different areas such as economics, engineering, environment and medicine. A strong assumption of the standard tobit model is that its errors follow a normal distribution. However, not all applications are well modeled by this distribution. Some efforts have relaxed the normality assumption by considering more flexible distributions. Nevertheless, the presence of asymmetry could not be well described by these flexible distributions. A real-world data application of measles vaccine in Haiti is explored, which confirms this asymmetry. We propose a tobit model with errors following a Birnbaum–Saunders (BS) distribution, which is asymmetrical and has shown to be a good alternative for describing medical data. Inference based on the maximum likelihood method and a type of residual are derived for the tobit–BS model. We perform global and local influence diagnostics to assess the sensitivity of the maximum likelihood estimators to atypical cases. A Monte Carlo simulation study is carried out to empirically evaluate the performance of these estimators. We conduct a data analysis for the mentioned application of measles vaccine based on the proposed model with the help of the R software. The results show the good performance of the tobit–BS model. 相似文献
28.
J. Pusz 《Australian & New Zealand Journal of Statistics》1995,37(1):83-87
The paper describes the Meixner hypergeometric distribution, characterised by properties of the regression of products of linear transformations of random variables with respect to residuals. 相似文献
29.
林表文 《榆林高等专科学校学报》2008,18(6):52-54
通过分析炎热地区建筑节能需求和节能设计标准要求,计算出不采用节能措施条件下围护结构传热量和采用节能墙体条件下的传热量,并与采用节能型外窗条件下的传热量进行比较,得出中空玻璃内置百叶窗具有明显有效的隔热保温效果。提出中空玻璃内置百叶窗的推广意义和推广价值。 相似文献
30.
Eka Shinjikashvili 《Australian & New Zealand Journal of Statistics》2001,43(3):359-365
This paper considers record values of residuals or prediction errors in a one-parameter autoregressive process and the statistic Z n = number of ε -repetitions of this record. When the parameter of the autoregression is unknown, the prediction errors, and therefore Z n , are unobservable. Here an observable analogue ̂ n of Z n is considered. It is proved that under special conditions the difference Z n − unobservable. Here an observable analogue ̂ n converges to zero in probability and therefore that unobservable. Here an observable analogue ̂ n has the same asymptotic behaviour as Z n . 相似文献