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71.
Mohammed Chowdhury Colin Wu Reza Modarres 《Journal of Statistical Computation and Simulation》2017,87(15):2900-2914
Nonparametric estimation and inferences of conditional distribution functions with longitudinal data have important applications in biomedical studies, such as epidemiological studies and longitudinal clinical trials. Estimation approaches without any structural assumptions may lead to inadequate and numerically unstable estimators in practice. We propose in this paper a nonparametric approach based on time-varying parametric models for estimating the conditional distribution functions with a longitudinal sample. Our model assumes that the conditional distribution of the outcome variable at each given time point can be approximated by a parametric model after local Box–Cox transformation. Our estimation is based on a two-step smoothing method, in which we first obtain the raw estimators of the conditional distribution functions at a set of disjoint time points, and then compute the final estimators at any time by smoothing the raw estimators. Applications of our two-step estimation method have been demonstrated through a large epidemiological study of childhood growth and blood pressure. Finite sample properties of our procedures are investigated through a simulation study. Application and simulation results show that smoothing estimation from time-variant parametric models outperforms the existing kernel smoothing estimator by producing narrower pointwise bootstrap confidence band and smaller root mean squared error. 相似文献
72.
Saba Mohammed Alwan 《Journal of Statistical Computation and Simulation》2017,87(9):1887-1900
This paper focuses on the study of the optimal control problem of the unstable stochastic lattice gas of prey–predator model with pair-approximation. The Pontryagin minimum procedure is used to derive the optimal behaviour of the proposed system that makes it trajectory closer to its general equilibrium states with respect to a selected performance measure during a specified period of time T. Wide numerical simulations and illustrations are presented in graphs and tables. 相似文献
73.
Mohammed Mohammed El Genidy 《统计学通讯:理论与方法》2017,46(16):7969-7975
Since many years scientists have carried out researches about bird migration, but due to the large number of bird types estimated at around 10,000 in the world, it is not easy to predict the maximum number of migratory bird types through limited number of migration years. In this study, a multiple non linear regression model of maximum number probability function of migratory bird types has been obtained and can be used in the prediction of the maximum number of migratory bird types during any migration years. 相似文献
74.
75.
Huda Mohammed Alomari Antoine Ayache Myriam Fradon Andriy Olenko 《Scandinavian Journal of Statistics》2020,47(1):104-133
This paper studies cyclic long-memory processes with Gegenbauer-type spectral densities. For a semiparametric statistical model, new simultaneous estimates for singularity location and long-memory parameters are proposed. This generalized filtered method-of-moments approach is based on general filter transforms that include wavelet transformations as a particular case. It is proved that the estimates are almost surely convergent to the true values of parameters. Solutions of the estimation equations are studied, and adjusted statistics are proposed. Monte-Carlo study results are presented to confirm the theoretical findings. 相似文献
76.
77.
In this article, we propose a nonparametric estimator for percentiles of the time-to-failure distribution obtained from a linear degradation model using the kernel density method. The properties of the proposed kernel estimator are investigated and compared with well-known maximum likelihood and ordinary least squares estimators via a simulation technique. The mean squared error and the length of the bootstrap confidence interval are used as the basis criteria of the comparisons. The simulation study shows that the performance of the kernel estimator is acceptable as a general estimator. When the distribution of the data is assumed to be known, the maximum likelihood and ordinary least squares estimators perform better than the kernel estimator, while the kernel estimator is superior when the assumption of our knowledge of the data distribution is violated. A comparison among different estimators is achieved using a real data set. 相似文献
78.
Shakir Hussain Mohammed A. Mohammed M. Sayeed Haque Roger Holder John Macleod Richard Hobbs 《统计学通讯:模拟与计算》2013,42(9):1779-1784
Multiple Imputation (MI) is an established approach for handling missing values. We show that MI for continuous data under the multivariate normal assumption is susceptible to generating implausible values. Our proposed remedy, is to: (1) transform the observed data into quantiles of the standard normal distribution; (2) obtain a functional relationship between the observed data and it's corresponding standard normal quantiles; (3) undertake MI using the quantiles produced in step 1; and finally, (4) use the functional relationship to transform the imputations into their original domain. In conclusion, our approach safeguards MI from imputing implausible values. 相似文献
79.
In the setting of additive regression model for continuous time process, we establish the optimal uniform convergence rates and optimal asymptotic quadratic error of additive regression. To build our estimate, we use the marginal integration method. 相似文献
80.
Sideeq Mohammed 《Culture and Organization》2020,26(3):196-210
ABSTRACTThe ‘management guru’ text has long been a source of interest for academic audiences. In this tradition, this paper argues that the content and underpinning ideology of the guru guide hold important insights for organizational scholars interested in the works of Gilles Deleuze and Felix Guattari (and vice versa). Specifically, this paper will demonstrate that a close reading of entrepreneur and guru, Tim Ferriss’s, Tools of Titans, can provide meaningful exegesis and development of the concept of ‘microfascism’ presented by Deleuze and Guattari across their shared and independent corpuses. Building upon extant organization studies literature, this paper will endeavour to contribute to the commentary on the management guru by suggesting that the desire for fascism, power, conformity, and rule-following of which Deleuze and Guattari speak offers a productive way of understanding the success of the management guru and the broader allure of the management advice industry. 相似文献