加速和可解释的斜随机生存森林
Byron C Jaeger1, Sawyer Welden1, Kristin Lenoir1
1Department of Biostatistics and Data Science, Wake Forest University School of Medicine, Winston-Salem, NC.
概括
我们开发了一种更快的斜随机生存森林 (RSF) 和一种新的变量重要性 (VI) 方法. 这种方法提高了计算效率,并准确地确定了生存分析中的重要预测因素.
科学领域:
- 机器学习 机器学习
- 生物统计学 生物统计学
- 计算统计学 计算统计学
背景情况:
- 斜随机生存森林 (RSF) 为右翼审查的数据提供了高的预测准确性.
- 标准RSF使用每个树单个预测器,而斜式RSF使用线性组合,增加计算成本.
- 在斜式RSF中估计变量重要性 (VI) 的方法有限.
研究的目的:
- 为了提高斜式RSF的计算效率.
- 引入一种可靠的方法来估计斜式RSF的变量重要性 (VI).
- 为这些方法提供可访问的R包 (aorsf).
主要方法:
- 使用牛顿-拉普森评分实现了一个计算效率高的斜式RSF.
- 开发了一种"否定VI"方法,通过评估预测系数对袋外准确度的影响.
- 与现有的斜式RSF软件进行基准测试,并通过模拟比较VI方法.
主要成果:
- 新的斜式RSF实现比现有软件快数百倍,保持预测准确度.
- "否定VI"在区分相关与无关的数值预测指标方面表现优异,与 VI,Shapley VI和基于ANOVA的VI相比.
- aorsf R包提供了这些先进的斜式RSF方法的访问权限.
结论:
- 开发的方法显著提高了斜RSF用于生存分析的速度和可用性.
- "否定VI"方法提供了一个更准确的方法来评估斜式RSF的变量重要性.
- 这些进步有助于更广泛地应用复杂的生存建模技术.
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