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Survival models analyze the time until one or more events occur, such as death in biological organisms or failure in mechanical systems. These models are widely used across fields like medicine, biology, engineering, and public health to study time-to-event phenomena. To ensure accurate results, survival analysis relies on key assumptions and careful study design.
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Comparing the Survival Analysis of Two or More Groups01:20

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Survival analysis is a cornerstone of medical research, used to evaluate the time until an event of interest occurs, such as death, disease recurrence, or recovery. Unlike standard statistical methods, survival analysis is particularly adept at handling censored data—instances where the event has not occurred for some participants by the end of the study or remains unobserved. To address these unique challenges, specialized techniques like the Kaplan-Meier estimator, log-rank test, and...
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Survival Tree01:19

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Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
 Building a Survival Tree
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Censoring Survival Data01:09

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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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Kaplan-Meier Approach01:24

Kaplan-Meier Approach

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The Kaplan-Meier estimator is a non-parametric method used to estimate the survival function from time-to-event data. In medical research, it is frequently employed to measure the proportion of patients surviving for a certain period after treatment. This estimator is fundamental in analyzing time-to-event data, making it indispensable in clinical trials, epidemiological studies, and reliability engineering. By estimating survival probabilities, researchers can evaluate treatment effectiveness,...
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Introduction To Survival Analysis01:18

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Survival analysis is a statistical method used to study time-to-event data, where the "event" might represent outcomes like death, disease relapse, system failure, or recovery. A unique feature of survival data is censoring, which occurs when the event of interest has not been observed for some individuals during the study period. This requires specialized techniques to handle incomplete data effectively.
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Inferencia posterior a la selección para el análisis de mediación de alta dimensión con resultados de supervivencia

Tzu-Jung Huang1, Zhonghua Liu2, Ian W McKeague2

  • 1Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA.

Scandinavian journal of statistics, theory and applications
|August 25, 2025
PubMed
Resumen

Los investigadores desarrollaron un nuevo método estadístico para identificar mediadores causales en datos de alta dimensión, cruciales para comprender las vías de la enfermedad. Este enfoque permite una inferencia válida después de seleccionar posibles mediadores, avanzando la inferencia causal en genómica.

Palabras clave:
inferencia causalcontrol de la tasa de error de la familiaanálisis de la mediaciónPruebas múltiplesasintóticas no estándarInferencia después de la seleccióndatos censurados por la derecha

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Área de la Ciencia:

  • Estadísticas biológicas
  • La genómica
  • Epidemiología

Sus antecedentes:

  • La identificación de los mediadores causales es vital para comprender las relaciones exposición-resultado, especialmente en los datos genómicos de alta dimensión.
  • Los métodos existentes carecen de una inferencia post-selección válida para efectos de mediación marginales con muchos mediadores potenciales.

Objetivo del estudio:

  • Desarrollar un procedimiento de inferencia post-selección robusto para el efecto indirecto natural seleccionado al máximo.
  • Abordar el desafío de los mediadores de alta dimensión en el análisis de la vía causal.

Principales métodos:

  • Se utilizó un enfoque de función de influencia eficiente semiparamétrica.
  • Desarrolló un estimador estabilizado de un solo paso con normalidad asintótica, que explica la selección del mediador.
  • Utilizó estudios de simulación para evaluar el rendimiento empírico.

Principales resultados:

  • El método propuesto demuestra un buen rendimiento empírico en simulaciones.
  • Se aplicó con éxito el enfoque a un conjunto de datos de cáncer de pulmón.
  • Se identificaron múltiples sitios de metilación de ADN CpG que podrían mediar el efecto del tabaquismo en la supervivencia del cáncer de pulmón.

Conclusiones:

  • El método desarrollado proporciona una inferencia post-selección válida para el análisis de mediación de alta dimensión.
  • Ofrece una herramienta poderosa para descubrir vías biológicas en estudios genómicos.
  • Facilita la identificación de nuevos biomarcadores para el riesgo y la progresión de la enfermedad.