2 (HT2) statistic has previously been used t'/> Robustness and sensitivity of hotelling's T2-based permutation tests for selection of 3D morphological markers
首页> 外文会议>IEEE International Symposium on Biomedical Imaging: From Nano to Macro >Robustness and sensitivity of hotelling's T2-based permutation tests for selection of 3D morphological markers
【24h】

Robustness and sensitivity of hotelling's T2-based permutation tests for selection of 3D morphological markers

机译:基于hotelling的基于T2的置换测试的稳健性和敏感性,用于选择3D形态学标记

获取原文

摘要

Multivariate statistics are a powerful tool to analyze morphological changes in three-dimensional brain structures. The Hotelling's T2 (HT2) statistic has previously been used to this purpose. HT2 is a parametric test which assumes normal distribution of the data: when this does not hold, as often happens for shape analysis, the test can still be used as basis for nonparametric permutation tests (PT). In their approximate version, PT are nondeterministic, being affected by the randomly pooled subset of permutations. In this study, we investigate the sensitivity and robustness of HT2-based PT, with respect to nondeterministic effects, both on simulated data and a medical application: the detection of hippocampal morphological changes to accurately predict conversion to Alzheimer's disease. The sensitivity of PT increases significantly with larger sample size, while is less dependent on the number of permutations. Moreover, PT provides statistically consistent classification performances: 80% accuracy in predicting conversion to Alzheimer's disease.
机译:多元统计数据是分析三维大脑结构形态变化的强大工具。 Hotelling的T 2 (HT 2 )统计信息先前已用于此目的。 HT 2 是一个参数测试,它假设数据呈正态分布:当形状分析中经常发生这种情况时,如果不保持数据正态分布,则该测试仍可以用作非参数置换测试(PT)的基础。在其近似版本中,PT是不确定的,受随机汇总的排列子集影响。在这项研究中,我们研究了基于HT 2 的PT在模拟数据和医学应用方面的不确定性方面的敏感性和鲁棒性:检测海马形态变化以准确预测转化为阿尔茨海默氏病。 PT的灵敏度随着样本数量的增加而显着增加,而对排列数量的依赖性则较小。此外,PT提供了统计上一致的分类性能:预测转化为阿尔茨海默氏病的准确性为80%。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号