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相关概念视频

Sample Size Calculation01:19

Sample Size Calculation

Knowledge of the sample size is the first requirement to conduct random sampling or an experiment. The sample size is the total number of units, observations, or groups (in some cases) used to get the data to estimate a population parameter. As the name suggests, the sample size is that of the sample drawn from the population and differs from the population size.
The sample size for the given experiment or sampling effort is fundamental to any study design. Sample size decides the number of...

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相关实验视频

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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
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使用贝叶斯更新的任务相关的功能性MRI研究的样本大小估计.

Eduard T Klapwijk1, Joran Jongerling2, Herbert Hoijtink3

  • 1Erasmus University Rotterdam, Netherlands.

Developmental cognitive neuroscience
|December 25, 2024
PubMed
概括
此摘要是机器生成的。

确定功能性MRI (fMRI) 研究的样本大小具有挑战性. 这项研究引入了实证贝叶斯更新,用于样本大小估计,改善研究规划和fMRI数据的可靠性.

关键词:
贝叶斯更新是贝叶斯更新.效果大小的影响大小.动力分析 动力分析在R包中,R包是R包.感兴趣的地区样本的大小 样本大小

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Last Updated: May 12, 2026

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科学领域:

  • 神经科学是一个神经科学.
  • 认知神经科学 认知神经科学
  • 神经成像是一种神经成像.

背景情况:

  • 功能磁共振成像 (fMRI) 研究需要足够的样本大小,以可靠地检测效应.
  • 使用已公布效果大小的传统样本大小计算对于fMRI研究来说往往很困难.
  • 准确的样本大小估计对于fMRI发现的有效性和可重复性至关重要.

研究的目的:

  • 介绍一种使用经验贝叶斯更新的与任务相关的fMRI研究中的样本大小估计的替代方法.
  • 为研究人员提供一个实用的方法来规划研究项目和报告样本大小估计.
  • 为了使样本大小估计的精细化,随着新数据的可用性.

主要方法:

  • 利用经验贝叶斯更新来估计基于现有的类似fMRI数据的样本大小.
  • 采用四个现有的fMRI数据集来说明该方法.
  • 评估了科恩对血液动力学反应的d和皮尔森对任务效应和年龄的相关性.

主要成果:

  • 证明所需的样本大小在不同的任务和fMRI感兴趣的区域之间有很大差异.
  • 展示了贝叶斯更新的实用性,用新的数据来改进样本大小估计.
  • 使用现实世界fMRI数据集验证了拟议的方法.

结论:

  • 实证贝叶斯更新为与任务相关的fMRI中样本大小估计提供了一个强大的替代方案.
  • 该方法通过提供基于数据的样本大小建议来增强fMRI研究的规划和执行.
  • 提供了一个R包,以促进在未来的fMRI研究中应用这种贝叶斯更新方法.