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相关概念视频

Mean free path and Mean free time01:22

Mean free path and Mean free time

5.2K
Consider the gas molecules in a cylinder. They move in a random motion as they collide with each other and change speed and direction. The average of all the path lengths between collisions is known as the "mean free path."
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Receptor-mediated Endocytosis01:39

Receptor-mediated Endocytosis

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Overview
111.0K
Receptor-mediated Endocytosis01:20

Receptor-mediated Endocytosis

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Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...
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Noncompartmental Analysis: Mean Residence Time01:05

Noncompartmental Analysis: Mean Residence Time

610
According to statistical moment theory, mean residence time (MRT) is an important measure in pharmacokinetics. MRT can be defined as the expected mean of a probability density function distribution. It provides valuable insights into drug disposition in the body.
After the administration of a drug through intravenous bolus injection, the drug molecules are distributed throughout the body and remain there for varying periods. The MRT represents the average time these drug molecules stay in the...
610
Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

11.9K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
11.9K
Noncompartmental Analysis: Mean Transit, Absorption and Dissolution Time01:02

Noncompartmental Analysis: Mean Transit, Absorption and Dissolution Time

391
When drugs are administered extravascularly, a comprehensive evaluation through noncompartmental analysis becomes imperative. This analytical approach considers various parameters that play a crucial role in understanding the pharmacokinetics of these drugs.
One of the key parameters is the mean transit time (MTT), which refers to the total duration required for drug molecules to transit through the body. MTT is determined by calculating the ratio of the area under the moment curve to the area...
391

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相关实验视频

Updated: Feb 6, 2026

Establishing a Competing Risk Regression Nomogram Model for Survival Data
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Establishing a Competing Risk Regression Nomogram Model for Survival Data

Published on: October 23, 2020

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调解分析的特定路径效应方法,使用时间变化的调解员和时间到事件的结果,考虑竞争风险.

Arce Domingo-Relloso1,2,3, Yuchen Zhang1, Ziqing Wang1

  • 1Department of Biostatistics, Columbia University Mailman School of Public Health, New York, New York, USA.

Statistics in medicine
|February 5, 2026
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的生存分析方法,考虑了纵向中介的竞争风险. 该方法澄清了暴露如何影响结果和竞争事件,改善因果推理.

关键词:
竞争的风险竞争的风险.的g-公式.纵向数据 纵向数据 纵向数据调解分析 调解分析路径特定的影响.生存分析,生存分析.

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相关实验视频

Last Updated: Feb 6, 2026

Establishing a Competing Risk Regression Nomogram Model for Survival Data
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An R-Based Landscape Validation of a Competing Risk Model
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Competing-Risk Nomogram for Predicting Cancer-Specific Survival in Multiple Primary Colorectal Cancer Patients after Surgery
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科学领域:

  • 生物统计学 生物统计学
  • 流行病学 流行病学
  • 因果推理因果推理

背景情况:

  • 生存分析通常会产生偏见的估计,当忽略竞争事件时.
  • 现有的调解分析方法不能充分解决具有非终端结果和竞争风险的不可分离的风险.

研究的目的:

  • 为纵向调解分析提出一个新的框架,考虑竞争风险.
  • 扩展路径特异效应框架,以处理与非终端调解器和结果的情况.

主要方法:

  • 开发了一种使用路径特异效应框架和调解g-formula的新方法.
  • 纳入竞争事件作为兴趣的纵向中介体内的嵌套中介.
  • 提出了一种详细的算法,用于在存在竞争风险的情况下估计路径特异性影响.

主要成果:

  • 拟议的方法提供了因果调解分析与竞争风险的理论表述和算法描述.
  • 一项模拟研究证明了新方法的有效性和性能.
  • 强心研究的应用揭示了血压对/和心血管疾病的调解作用,将死亡视为与之竞争的风险.

结论:

  • 新的框架提供了一种透明的方法,用于评估长度研究中暴露对结果和竞争风险的影响.
  • 这种方法在复杂的场景中增强了因果推断,其中包括竞争事件和时间到事件数据.
  • 该方法适用于各种领域,包括环境健康和临床研究,以更细致地了解因果途径.