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941.
Y. Khadem 《统计学通讯:模拟与计算》2019,48(3):684-703
Rahim and Banerjee considered a constant integral of the hazard function for all sampling intervals. This led the sampling intervals to depend on the extended first sampling interval (h1). Since this limitation might not lead to an optimal situation, we first showed that elimination of the mentioned restriction did not cause any significant change in the average quality cycle cost. So if one is looking for an ideal cost and the simplicity of the process, the approach taken in Rahim and Banerjee’s study is the best procedure to adopt. Moreover, in many cases of non-uniform sampling method the first sampling interval becomes so large and this can sometimes lead the production system to the out-of-control state due to unexpected failures that might happen during that time. Therefore, we proposed a new model of uniform and non-uniform sampling intervals combination that allows us to confine the value of h1 without undergoing high costs. The proposed model showed that the quality cycle cost of the proposed model is lower than Rahim and Banerjee’s model in the economic-statistical state. For more illustration, we conducted sensitivity analysis and gave numerical examples. 相似文献
942.
In this article, we first propose the classical multivariate generalized Birnbaum–Saunders kernel estimator for probability density function estimation in the context of multivariate non negative data. Then, we apply two multiplicative bias correction (MBC) techniques for multivariate kernel density estimator. Some properties (bias, variance, and mean integrated squared error) of the corresponding estimators are also investigated. Finally, the performances of the classical and MBC estimators based on family of generalized Birnbaum–Saunders kernels are illustrated by a simulation study. 相似文献
943.
This paper examines the potential impact of US monetary normalisation on sovereign bond yields in Asia Pacific. We apply the quantile vector autoregressive model with principal component analysis to the assessment of tail risk of sovereign debt, which may not be detectable using traditional OLS-based analysis. Our empirical evidence suggests that US Treasury bond yields can have a significant impact on sovereign bond yields in the region, an important channel through which monetary normalisation by the Fed can affect Asia-Pacific economies. Increases in sovereign bond yields will not only compromise the ability of the sovereigns in the region to service their debt but also translate into higher costs of borrowing for the rest of economy. The results show how much the outsized impact could potentially be if US monetary normalisation somehow turns out to be much more disorderly than expected. 相似文献
944.
In this paper a test for outliers based on externally studentized residuals is shown to be related to a test for predictive failure. The relationships between a test for outliers, a test for a correlated mean shift and a test for an intercept shift are developed. A sequential testing procedure for outliers and structural change is shown to be independent, so that the overall size of the joint test can be determined exactly. It is established that a joint test for outliers and constancy of variances cannot be performed. 相似文献
945.
Jennifer S.K. Chan Anthony Y.C. Kuk James Bell & Charles Mc Gilchrist 《Australian & New Zealand Journal of Statistics》1998,40(1):1-10
The paper develops methods for the statistical analysis of outcomes of methadone maintenance treatment (MMT). Subjects for this study were a cohort of patients entering MMT in Sydney in 1986. Urine drug tests on these subjects were performed weekly during MMT, and were reported as either positive or negative for morphine, the marker of recent heroin use. To allow correlation between the repeated binary measurements, a marginal logistic model was fitted using the generalized estimating equation (GEE) approach and the alternating logistic regression approach. Conditional logistic models are also considered. Results of separate fitting to each patient and score tests suggest that there is substantial between-patient variation in response to MMT. To account for the population heterogeneity and to facilitate subject-specific inference, the conditional logistic model is extended by introducing random intercepts. The two, three and four group mixture models are also investigated. The model of best fit is a three group mixture model, in which about a quarter of the subjects have a poor response to MMT, with continued heroin use independent of daily dose of methadone; about a quarter of the subjects have a very good response, with little or no heroin use, again independent of dose; and about half the subjects responded in a dose-dependent fashion, with reduced heroin use while receiving higher doses of methadone. These findings are consistent with clinical experience. There is also an association between reduced drug use and increased duration in treatment. The mixture model is recommended since it is quite tractable in terms of estimation and model selection as well as being supported by clinical experience. 相似文献
946.
L.Y. Chan J.H. Meng Y.C. Jiang & Y.N. Guan 《Australian & New Zealand Journal of Statistics》1998,40(3):359-372
The paper discusses D-optimal axial designs for the additive quadratic and cubic mixture models σ1≤i≤q(βixi + βiix2i) and σ1≤i≤q(βixi + βiix2i + βiiix3i), where xi≥ 0, x1 + . . . + xq = 1. For the quadratic model, a saturated symmetric axial design is used, in which support points are of the form (x1, . . . , xq) = [1 ? (q?1)δi, δi, . . . , δi], where i = 1, 2 and 0 ≤δ2 <δ1 ≤ 1/(q ?1). It is proved that when 3 ≤q≤ 6, the above design is D-optimal if δ2 = 0 and δ1 = 1/(q?1), and when q≥ 7 it is D-optimal if δ2 = 0 and δ1 = [5q?1 ? (9q2?10q + 1)1/2]/(4q2). Similar results exist for the cubic model, with support points of the form (x1, . . . , xq) = [1 ? (q?1)δi, δi, . . . , δi], where i = 1, 2, 3 and 0 = δ3 <δ2 < δ1 ≤1/(q?1). The saturated D-optimal axial design and D-optimal design for the quadratic model are compared in terms of their efficiency and uniformity. 相似文献
947.
948.
The current study examined some of the factors that may contribute to the low rates of participation of male versus female students in sexual coercion research. Specifically, we tested whether recruitment rates are adversely affected by the topic of the research or the gender of the recruiter. Introductory psychology classes were randomly assigned to a male or female recruiter and to either the memory or sex research condition. Three significant predictors assisted in differentiating students who signed up for the studies from those who did not. Overall, female students were more likely to volunteer to participate. In addition, all students were more likely to sign up for the sex research, especially when they were recruited by a male research assistant. This study confirmed our hypothesis that men are not volunteering to participate at a rate equal to their enrollment. However this problem appears to be a general concern for all researchers who use similar recruitment practices rather than specifically for researchers of sexual coercion. 相似文献
949.
950.