Classification methodology for mitigating the effects of unreliable class assignments in high dimensional biomedical data

减轻高维生物医学数据中不可靠类别分配影响的分类方法

• 批准号: 217281-2009
• 负责人: Pizzi, Nicolino
• 金额: $ 1.09万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=424863
• 关键词: Classification; methodology; mitigating; effects; unreliable

Classifying biomedical data involves finding a mapping (relationship) from patterns (e.g., data relating to some type of tissue) to a set of classes (e.g., disease states). Patterns are represented by features (e.g., concentrations of biological compounds) and class labels are assigned using a reference test (RT) (e.g., a medical expert's analysis of tissue being "normal" or "abnormal"). This process often suffers from three significant challenges: the RT may be unreliable; the number of patterns is low; and the number of features in a pattern is high. While RTs may be well-established benchmarks, they are seldom perfectly accurate and sometimes improperly applied. Nevertheless, any strategy that compensates for this imprecision must ensure that the mapping is correctly validated against the benchmark. The last two challenges, known collectively as the "curse of dimensionality", cause an inability to find robust, general solutions. This is often addressed by transformations that select the most discriminatory subset of features while not impeding the medical expert's ability to make informed judgments about the mapping's predictive power.

对生物医学数据进行分类涉及从模式（例如，与某种类型的组织有关的数据）到一组类别（例如，疾病状态）。模式由特征表示（例如，生物化合物的浓度）和类别标记使用参考测试（RT）（例如，医学专家对组织是“正常”还是“异常”的分析）。这一过程通常面临三个重大挑战：RT可能不可靠;模式数量少;模式中的特征数量多。虽然风险测试可能是既定的基准，但它们很少完全准确，有时应用不当。然而，任何补偿这种不精确性的策略都必须确保映射根据基准进行正确的验证。最后两个挑战，统称为“维数灾难”，导致无法找到强大的，一般的解决方案。这通常通过选择最具区分性的特征子集的转换来解决，同时不妨碍医学专家对映射的预测能力做出明智判断的能力。