Using OrPLS to Identify Asymptomatic Women at Risk For Alzheimer's Disease.

Using OrPLS to Identify Asymptomatic Women at Risk For Alzheimer's Disease.
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DOI:
10.1002/cem.1172
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发表时间:
2008-09
影响因子:
2.4
通讯作者:
Smith, Charles
Smith, Charles
中科院分区:
化学3区
文献类型:
--
作者:
Rayens, William;Liu, Yushu;Andersen, Anders;Smith, Charles

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阿尔茨海默氏病(AD)风险的人表现出改变的皮质激活功能磁共振成像(fMRI)测量疾病的症状前几年的预期。我们使用fMRI研究了13名有AD家族史和至少一个载脂蛋白E4等位基因(AD的危险因素)的女性和11名缺乏这两个因素的女性对照组之间皮质激活的差异。我们的主要目标是评估两组在统计上的分离程度,这是一项直接影响事后分类性能的任务。然而,数据集的维度排除了使用普通分类方法。在本文中,我们展示了使用定向PLS(OrPLS)来完成分类在这个维度问题的存在下的优越性。我们能够降低标准化的fMRI数据的错误分类率从PCA的平均约48%,PLS的平均27%,然后到完美的分类OrPLS。
Persons at risk for Alzheimer's disease (AD) demonstrate altered cortical activation measured by functional MRI (fMRI) years before symptoms of disease are expected. We used fMRI to study the differences in cortical activation between 13 women with a family history of AD and at least one apolipoprotein E4 allele, a risk factor for AD, and a control group of 11 women lacking both factors. Our primary goal was to assess how well the two groups are able to be statistically separated, a task which directly affects the performance of post hoc classification. The dimension of the dataset, however, precludes the use of ordinary classification methods. In this paper we show the superiority of using oriented PLS (OrPLS) to accomplish the classification in the presence of this dimensionality problem. We are able to reduce the misclassification rates on the standardized fMRI data from an average of about 48% for PCA, to an average of 27% for PLS, and then to perfect classification for OrPLS.
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