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Moumita Chatterjee Sugata Sen Roy 《Journal of Statistical Computation and Simulation》2018,88(16):3098-3115
In this paper, we study the survival times of alternately occurring events. The dependence between the times to the two events is modelled through the Archimedean copula, while the dependence over the recurring cycles is modelled through a functional relationship of the distribution parameters. Taking account of appropriate censoring that may be present in the data, the model parameters are estimated using the maximum likelihood method. The standard errors of the estimators are then derived and confidence belts for the survival functions constructed. Methods for choosing the appropriate copula are also discussed. The results are illustrated through a clinical trial data on patients suffering from cystic fibrosis. A simulation study is also done to corroborate the results. 相似文献
44.
Risk information is critical to adopting mitigation measures, and seeking risk information is influenced by a variety of factors. An essential component of the recently adopted My Safe Florida Home (MSFH) program by the State of Florida is to provide homeowners with pertinent risk information to facilitate hurricane risk mitigation activities. We develop an analytical framework to understand household preferences for hurricane risk mitigation information through allowing an intensive home inspection. An empirical analysis is used to identify major drivers of household preferences to receive personalized information regarding recommended hurricane risk mitigation measures. A variety of empirical specifications show that households with home insurance, prior experience with damages, and with a higher sense of vulnerability to be affected by hurricanes are more likely to allow inspection to seek information. However, households with more members living in the home and households who live in manufactured/mobile homes are less likely to allow inspection. While findings imply MSFH program's ability to link incentives offered by private and public agencies in promoting mitigation, households that face a disproportionately higher level of risk can get priority to make the program more effective. 相似文献
45.
Shoutir Kishore Chatterjee Kalyan Das 《Journal of statistical planning and inference》1983,8(1):27-41
In the unbalanced one-way random effects model the weighted least squares approach with estimated weights is used to develop a relatively simple estimator of variance components. As the number of classes increases, the proposed estimator is seen not only to be best asymptotically normal but also to be asymptotically equivalent to the maximum likelihood estimator. 相似文献
46.
The motivation for this paper is a cystic fibrosis data which records a patient’s times to relapse and times to cure under several recurrences of the disease. The idea is to study the impact of covariates on the hazard rates of two alternately occurring events. The dependence between the times to the two events over the different cycles is modeled through an autoregressive-type setup. The partial likelihood function is then derived and the estimators obtained. The estimators are shown to be consistent and asymptotically normal. The technique is applied to study the motivating data. A simulation study is also conducted to corroborate the results. 相似文献
47.
Several approaches have been suggested for fitting linear regression models to censored data. These include Cox's proportional hazard models based on quasi-likelihoods. Methods of fitting based on least squares and maximum likelihoods have also been proposed. The methods proposed so far all require special purpose optimization routines. We describe an approach here which requires only a modified standard least squares routine. We present methods for fitting a linear regression model to censored data by least squares and method of maximum likelihood. In the least squares method, the censored values are replaced by their expectations, and the residual sum of squares is minimized. Several variants are suggested in the ways in which the expectation is calculated. A parametric (assuming a normal error model) and two non-parametric approaches are described. We also present a method for solving the maximum likelihood equations in the estimation of the regression parameters in the censored regression situation. It is shown that the solutions can be obtained by a recursive algorithm which needs only a least squares routine for optimization. The suggested procesures gain considerably in computational officiency. The Stanford Heart Transplant data is used to illustrate the various methods. 相似文献
48.
Kashinath Chatterjee Angshuman Sarkar Dennis K.J. Lin 《Journal of statistical planning and inference》2008
A supersaturated design is essentially a fractional factorial design whose number of experimental variables is greater than or equal to its number of experimental runs. Under the effect sparsity assumption, a supersaturated design can be very cost-effective. In this paper, our prime objective is to compare the existing two-level supersaturated designs for the noisy case through the probability of correct searching—a powerful criterion proposed by Shirakura et al. [1996. Searching probabilities for nonzeroeffects in search designs for the noisy case. Ann. Statist. 24, 2560–2568]. An algorithm is proposed to construct supersaturated designs with high probability of correct searching. Examples are given for illustration. 相似文献
49.
Kashinath Chatterjee 《统计学通讯:理论与方法》2013,42(6):2189-2223
This paper is in connection with search designs which permit the estimation of the general mean and main-effects, and allow the search and estimation of the possibly unknown non-zero effect among the two-factor interactions in the general asymmetric factorial set-up. This paper describes the construction of search designs in the above set-up. 相似文献
50.
Mary Searle‐Chatterjee 《Immigrants & Minorities》2013,31(1):12-25
The ‘untouchables’ of India are excluded from various areas of social and cultural life. Despite this, the higher castes do not exclude them from the category of ‘Hindu’ since, for them, the term is counterposed to the concept of ‘foreigner’. The lowest groups, on the other hand, often do not think of themselves as Hindus, for they use the word in terms of a very different set of conceptual oppositions. For them, ‘Hindus’ are people of high caste. Anderson's (1983) characterization of the nation as an ‘imagined community’ does not adequately explain why Hindu nationalists are now pressing minority ‘untouchables’ to define themselves as Hindus. Western reification of the concept of ‘Hindu’ has implications for political struggles in the sub‐continent. 相似文献