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471.
殷学侃 《广西师范学院学报(哲学社会科学版)》2011,(4):134-137
根据声学数据绘制的元音图可用于分析学习者的语音错误。声学元音图把不易观察到的舌位的前后及开口度的大小图表化了,便于教师依据图表准确识别学习者元音发音的错误。研究中,我们观察到学习者的声学元音图上元音变体(variants)的分布区域往往过大,表明学习者的英语元音发音方法不稳定.声学元音图上各元音变体分布区域往往交叉严重... 相似文献
472.
The Zero-inflated Poisson distribution (ZIP) is used to model the defects in processes with a large number of zeros. We propose a control charting procedure using a combination of two cumulative sum (CUSUM) charts to detect increases in the parameters of ZIP process, one is a conforming run length (CRL) CUSUM chart and another is a zero truncated Poisson (ZTP) CUSUM chart. The control limits of the control charts are obtained using both Markov chain-based methods and simulations. Simulation experiments show that the proposed method outperforms an existing method. Finally, a real example is presented. 相似文献
473.
In this article, we employ the method of empirical likelihood to construct confidence intervals of conditional density for a left-truncation model. It is proved that the empirical likelihood ratio admits a limiting chi-square distribution with one degree of freedom when the lifetime observations with multivariate covariates form a stationary α-mixing sequence. 相似文献
474.
In this article, a multivariate synthetic control chart is developed for monitoring the mean vector of a normally distributed process. The proposed chart is a combination of the Hotelling's T 2 chart and Conforming Run Length chart. The operation, design, and performance of the chart are described. Average run length comparisons between some other existing control charts and the synthetic T 2 chart are presented. They indicate that the synthetic T 2 chart outperforms Hotelling's T 2 chart and T 2 chart with supplementary runs rules. 相似文献
475.
Understanding multivariate variability is a difficult task because there is no single measure that can be properly used. This article presents a new measure that features good properties. If this measure is simultaneously used with generalized variance, it will give a better understanding of multivariate variability. It can also efficiently be used for large data sets with high dimensions. Furthermore, when it is used for constructing a Shewhart-type chart to monitor multivariate variability, the resulting chart has a much better out-of-control ARL than the generalized variance chart. An example illustrates its advantage. 相似文献
476.
This article deals with residual treatment effects designs for the purpose of comparing v test treatments with a control treatment when the number of periods is no larger than v + 1. Control balanced residual treatment effects designs, which are Schur-optimal, are considered. Some methods of their construction are given. 相似文献
477.
Let X = (X, Y) be a pair of lifetimes whose dependence structure is described by an Archimedean survival copula, and let X t = [(X ? t, Y ? t) | X > t, Y > t] denotes the corresponding pair of residual lifetimes after time t ≥ 0. Multivariate aging notions, defined by means of stochastic comparisons between X and X t , with t ≥ 0, were studied in Pellerey (2008), who considered pairs of lifetimes having the same marginal distribution. Here, we present the generalizations of his results, considering both stochastic comparisons between X t and X t+s for all t, s ≥ 0 and the case of dependent lifetimes having different distributions. Comparisons between two different pairs of residual lifetimes, at any time t ≥ 0, are discussed as well. 相似文献
478.
Ming Ha Lee 《统计学通讯:理论与方法》2013,42(5):883-897
This study investigates the statistical properties of the adaptive Hotelling's T 2 charts with run rules in which the sample size and sampling interval are allowed to vary according on the current and past sampling points. The adaptive charts include variable sample size (VSS), variable sampling interval (VSI), and variable sample size and sampling interval (VSSI) charts. The adaptive Hotelling's T 2 charts with run rules are compared with the fixed sampling rate Hotelling's T 2 chart with run rules. The numerical results show that the VSS, VSI, and VSSI features improve the performance of the Hotelling's T 2 chart with run rules. 相似文献
479.
Bivariate aging notions for a vector X of lifetimes based on stochastic comparisons between X and X t, where X t is the multivariate residual lifetime after time t > 0, have been studied in Pellerey (2008) under the assumption that the dependence structure in X is described by an Archimedean survival copula. Similar stochastic comparisons between X t and X t+s, for all t; s > 0, were considered in Mulero and Pellerey (2010). In this article, these results are generalized and extended to the multivariate case. Two illustrative examples are also provided. 相似文献
480.
Chi-Jui Huang 《统计学通讯:理论与方法》2013,42(18):3841-3856
In this article, we extend a single exponentially weighted moving average semicircle (EWMA-SC) chart to a single generally weighted moving average (GWMA) chart. This new control chart can effectively combine the features of the SC chart with GWMA techniques, and can easily indicate the source and direction of a change. We perform simulations to evaluate the average run length, standard deviation of the run length, and diagnostic abilities of the GWMA-SC and EWMA-SC charts. An extensive comparison shows that the GWMA-SC control chart is more sensitive than the EWMA-SC chart for detecting small shifts in the process mean and/or variability. 相似文献