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Videos de Conceptos Relacionados

Cluster Sampling Method01:20

Cluster Sampling Method

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Appropriate sampling methods ensure that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
To choose a cluster sample, divide the population into clusters (groups) and then randomly select some of the clusters. All the members from these clusters are in the cluster sample. For example, if you randomly sample four departments from your...
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Time-Series Graph00:54

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A time-series graph is a line graph with repeated measurements taken at successive intervals of time. It is also called a time series chart. To construct a time-series graph, one must look at both pieces of a paired data set. The horizontal axis is used to plot the time increments, and the vertical axis is used to plot the values of the variable that one is measuring. By using the axes in this way, each point on the graph will correspond to time and a measured quantity. The points on the graph...
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Relative Frequency Histogram01:14

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The relative frequency depicts the proportion of data points that have each value. The frequency tells the number of data points that have each value. Like the histogram, a relative frequency histogram also has the same shape with a horizontal scale (the x-axis), but the vertical scale (the y-axis) is marked with relative frequencies (percentages of the whole) instead of actual frequencies. A relative frequency histogram is a graphical representation of a frequency distribution where the...
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Survival Tree01:19

Survival Tree

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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.
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Probability Histograms01:17

Probability Histograms

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A probability histogram is a visual representation of a probability distribution. Similar a typical histogram, the probability histogram consists of contiguous (adjoining) boxes. It has both a horizontal axis and a vertical axis. The horizontal axis is labeled with what the data represents. The vertical axis is labeled with probability. Each rectangular bar in the histogram is 1 unit wide, which suggests that the area under each bar equals the probability, P(x), where x is 1, 2, 3, and so on.
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Sequence Networks of Rotating Machines

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A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
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Video Experimental Relacionado

Updated: Sep 9, 2025

Large-scale Reconstructions and Independent, Unbiased Clustering Based on Morphological Metrics to Classify Neurons in Selective Populations
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Agrupación de datos de eventos recurrentes

G Babykina1, V Vandewalle2, J Carretero-Bravo3,4

  • 1ULR 2694 - METRICS - Évaluation des Technologies de Santé et des Pratiques Médicales, CHU Lille, Université de Lille, Lille, France.

Journal of applied statistics
|September 4, 2025
PubMed
Resumen

Este estudio introduce un nuevo modelo de mezcla para analizar eventos recurrentes, abordando efectivamente la heterogeneidad no observada. El modelo permite agrupar a las personas para una comprensión más profunda de la dinámica de los eventos en el cuidado de la salud y la industria.

Palabras clave:
Modelo de Andersen y GillAlgoritmo EMDatos de acontecimientos recurrentesAplicación en la medicinaagrupación basada en modelos

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Área de la Ciencia:

  • Estadísticas biológicas
  • Análisis de la supervivencia
  • Aprendizaje automático

Sus antecedentes:

  • Los datos con marca de tiempo requieren modelar la dinámica de eventos recurrentes más allá de los recuentos totales.
  • Los modelos existentes como Andersen-Gill y Cox luchan con la heterogeneidad no observada.
  • Las solicitudes incluyen reingresos hospitalarios, recurrencias de enfermedades y fallas industriales.

Objetivo del estudio:

  • Proponer un modelo de mezcla para eventos recurrentes para dar cuenta de la heterogeneidad no observada.
  • Permitir la clasificación sin supervisión (agrupación) de los individuos en función de las variables latentes.
  • Proporcionar una comprensión detallada de los procesos de eventos recurrentes dentro de grupos distintos.

Principales métodos:

  • Desarrolló un modelo de mezcla para datos de eventos recurrentes.
  • Especificación de la intensidad paramétrica incorporada ajustada para las covariables dentro de cada grupo.
  • Se utiliza la estimación de la probabilidad máxima mediante el algoritmo Expectation-Maximization (EM).
  • Utilizó el Criterio de Información Bayesiana (BIC) para la selección óptima del número de clúster.

Principales resultados:

  • Factibilidad demostrada del modelo utilizando datos simulados.
  • Aplicó el modelo a los datos reales de readmisión hospitalaria para los ancianos.
  • Identificó y caracterizó con éxito grupos distintos de individuos basados en patrones de eventos recurrentes.

Conclusiones:

  • El modelo de mezcla propuesto maneja efectivamente la heterogeneidad no observada en los datos de eventos recurrentes.
  • El agrupamiento proporciona información valiosa sobre distintos subgrupos de pacientes y su dinámica de eventos.
  • El modelo ofrece una poderosa herramienta para analizar datos complejos de eventos recurrentes en varios campos.