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Survival analysis is a statistical method used to analyze time-to-event data, often employed in fields such as medicine, engineering, and social sciences. One of the key challenges in survival analysis is dealing with incomplete data, a phenomenon known as "censoring." Censoring occurs when the event of interest (such as death, relapse, or system failure) has not occurred for some individuals by the end of the study period or is otherwise unobservable, and it might have many different...
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Humans are very diverse and although we share many similarities, we also have many differences. The social groups we belong to help form our identities (Tajfel, 1974). These differences may be difficult for some people to reconcile, which may lead to prejudice toward people who are different. Prejudice is a negative attitude and feeling toward an individual based solely on one’s membership in a particular social group (Allport, 1954; Brown, 2010). Prejudice is common against people who...
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The person's health status fluctuates continually, varying from being in good health to becoming ill and returning to being healthy. To understand the concept of illness prevention, there are two models. First, the health-illness continuum model is a graphic representation of an individual's wellness. It states that a person is considered healthy in the absence of physical disease and the presence of good emotional health.
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疾病死亡模型中的歧视性能与间隔审查的疾病数据.

Marta Spreafico1,2, Anja J Rueten-Budde1, Hein Putter1,2

  • 1Mathematical Institute, Leiden University, Leiden, the Netherlands.

Statistical methods in medical research
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概括

在疾病死亡模型中忽视间隔审查的疾病数据可能会影响歧视表现. 计算间隔审查对于准确的模型参数估计和临床研究中的性能评估至关重要.

关键词:
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科学领域:

  • 生物统计学 生物统计学
  • 临床流行病学临床流行病学
  • 生存分析的分析.

背景情况:

  • 疾病死亡模型是疾病进展分析的标准.
  • 临床数据通常具有因预定访问而引起的间隔审查的疾病发病特征.
  • 忽视间隔审查可能会影响模型性能评估.

研究的目的:

  • 评估忽视间隔审查的疾病数据对疾病死亡模式歧视的影响.
  • 为了比较不同估计方法对间隔审查的疾病死亡数据.
  • 用ROC曲线下的特定时间区域来评估歧视.

主要方法:

  • 使用维布尔过渡危险与间隔审查数据的模拟研究.
  • 考克斯模型 (忽略间隔审查) 与间隔审查的疾病死亡模型 (msm,SmoothHazard包) 的比较.
  • 应用到高档软组织肉瘤患者数据集 (n=2232).

主要成果:

  • 忽视间隔审查显著影响歧视绩效指标.
  • 经过间隔审查的模型 (断面常量,韦布尔,M-spline) 提供了更准确的估计.
  • 方法的选择影响了对模式歧视的评估.

结论:

  • 计算间隔审查对于准确的疾病死亡模型参数估计至关重要.
  • 适当处理间隔审查数据对于可靠的歧视绩效评估至关重要.
  • 这项研究强调了在临床研究中使用可靠的统计方法的重要性,其中包括时间到事件数据.