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相关概念视频

Detection of Gross Error: The Q Test01:00

Detection of Gross Error: The Q Test

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When one or more data points appear far from the rest of the data, there is a need to determine whether they are outliers and whether they should be eliminated from the data set to ensure an accurate representation of the measured value. In many cases, outliers arise from gross errors (or human errors) and do not accurately reflect the underlying phenomenon. In some cases, however, these apparent outliers reflect true phenomenological differences. In these cases, we can use statistical methods...
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Quantifying and Rejecting Outliers: The Grubbs Test01:02

Quantifying and Rejecting Outliers: The Grubbs Test

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Sometimes, a data set can have a recorded numerical observation that greatly  deviates from the rest of the data. Assuming that the data is normally distributed, a statistical method called the Grubbs test can be used to determine whether the observation is truly an outlier.  To perform a two-tailed Grubbs test, first, calculate the absolute difference between the outlier and the mean. Then, calculate the ratio between this difference and the standard deviation of the sample. This...
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Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

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The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
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Outliers and Influential Points01:08

Outliers and Influential Points

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An outlier is an observation of data that does not fit the rest of the data. It is sometimes called an extreme value. When you graph an outlier, it will appear not to fit the pattern of the graph. Some outliers are due to mistakes (for example, writing down 50 instead of 500), while others may indicate that something unusual is happening. Outliers are present far from the least squares line in the vertical direction. They have large "errors," where the "error" or residual is the...
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What Are Outliers?01:12

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Outliers are observed data points that are far from the least squares line. They have unusual values and need to be examined carefully. Though an outlier may result from erroneous data, at other times, it may hold valuable information about the population under study and should be included in the data. Hence, it is crucial to examine what causes a data point to be an outlier.
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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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相关实验视频

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Machine Learning Algorithms for Early Detection of Bone Metastases in an Experimental Rat Model
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在计算病理学中检测分布外数据的稳定距离

Di Zhang1, Jiusong Ge1, Jiashuai Liu1

  • 1School of Computer Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, China; Shaanxi Provincial Key Laboratory of Big Data Knowledge Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.

Medical image analysis
|August 31, 2025
PubMed
概括

计算病理模型需要分布外 (OOD) 检测以获得可靠的临床使用. 我们推出了稳定距离 (StaDis) 一种用于计算病理学的新的插入式OOD方法, 在新的基准上取得了最先进的结果.

关键词:
检测异常计算病理学多个实例学习在分布检测之外稀有案例采矿

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科学领域:

  • 计算病理学
  • 医学中的人工智能
  • 医学图像分析

背景情况:

  • 计算病理学 (CPath) 模型提高了病理学家的效率,但风险是无法看到数据的不可靠性.
  • 在CPath模型中缺乏OOD检测阻碍了临床信任和安全性.
  • 现有的OOD方法并不适合计算病理学的独特挑战.

研究的目的:

  • 引入专门为计算病理学设计的新型OOD检测方法.
  • 开发一种在现实临床环境中确保CPath模型可靠性的方法.
  • 建立新的基准来评估病理数据中的OOD检测.

主要方法:

  • 拟议的稳定距离 (StaDis) 是一个插即用OOD检测模块,用于测量图像与其扰乱版本之间的差异.
  • 在使用多个实例学习 (MIL) 框架的整个幻灯片图像 (WSI) 层面探索OOD检测.
  • 开发了异常检测,罕见病例挖掘和冷部分识别的病理性OOD检测基准.

主要成果:

  • 在38个实验中,StaDis在23个实验中实现了最先进的性能,并在10个实验中排名第二.
  • 通过使用"Conch"骨干的StaDis进行基于补丁的异常检测,AUROC提高了7.91%.
  • 这种方法在各种病理性OOD检测场景中被证明有效.

结论:

  • 稳定距离 (StaDis) 为计算病理学中OOD检测提供了强大而可适应的解决方案.
  • 拟议的方法提高了临床部署CPath模型的可靠性和可信性.
  • 开发的基准有助于在病理学中对OOD检测技术的未来研究和验证.