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arXiv 1108.2334stat.AP
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纵向神经影像学数据的两阶段经验似然

Two-stage empirical likelihood for longitudinal neuroimaging data

Xiaoyan Shi, Joseph G. Ibrahim, Jeffrey Lieberman, Martin Styner, Yimei Li, Hongtu Zhu

摘要:

纵向影像学研究对于理解神经精神疾病、物质使用障碍和正常大脑的神经发育至关重要。本文的主要目的是开发一个两阶段调整指数倾斜经验似然(TETEL)的纵向研究神经影像数据的空间分析。TETEL方法作为一种频率论方法,使我们能够有效地分析纵向数据,而无需建模时间相关性,并对不同的时间依赖的协变量类型进行分类。为了考虑空间依赖性,这里开发的TETEL方法专门将3维(3D)体积(或2D表面)上的每个体素(或像素)的最近邻域中的所有数据与适当的权重相结合,以计算自适应参数估计和自适应检验统计量。仿真研究被用来检查有限样本性能的调整指数倾斜似然比统计量和TETEL。我们证明了我们的统计方法的应用,以检测精神分裂症患者和健康受试者之间的纵向精神分裂症研究的海马形态变化的差异。

英文摘要:

Longitudinal imaging studies are essential to understanding the neural development of neuropsychiatric disorders, substance use disorders, and the normal brain. The main objective of this paper is to develop a two-stage adjusted exponentially tilted empirical likelihood (TETEL) for the spatial analysis of neuroimaging data from longitudinal studies. The TETEL method as a frequentist approach allows us to efficiently analyze longitudinal data without modeling temporal correlation and to classify different time-dependent covariate types. To account for spatial dependence, the TETEL method developed here specifically combines all the data in the closest neighborhood of each voxel (or pixel) on a 3-dimensional (3D) volume (or 2D surface) with appropriate weights to calculate adaptive parameter estimates and adaptive test statistics. Simulation studies are used to examine the finite sample performance of the adjusted exponential tilted likelihood ratio statistic and TETEL. We demonstrate the application of our statistical methods to the detection of the difference in the morphological changes of the hippocampus across time between schizophrenia patients and healthy subjects in a longitudinal schizophrenia study.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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