关键比较的决策树
Amanda Possolo1, Amanda Koepke1, David Newton2
1National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
概括
一个新的决策树指导了统计模型的选择,用于衡量学中的关键比较. 它有助于计算各种科学领域适用的参考值和等效度.
科学领域:
- 在化学和生物学中的计量学.
- 统计建模 统计建模
- 测量科学 测量科学 测量科学
背景情况:
- 化学和生物学物质量计量咨询委员会 (CCQM) 的无机分析工作组 (IAWG) 要求在关键比较 (KC) 中为统计模型选择提供指导.
- 现有的方法可能不涵盖在KC中遇到的所有场景.
- 对于数据缩小和模型选择的标准化方法的需求对于一致和可靠的结果至关重要.
研究的目的:
- 引入决策树,以指导统计模型的选择和关键比较 (KC) 的数据缩小程序.
- 为计算关键比较参考值 (KCRV),其不确定性和等效度 (DoE) 提供一个框架.
- 为各种计量工作组和咨询委员会提供一个广泛适用的工具.
主要方法:
- 开发一个结合三个统计测试的决策树.
- 决策树包括五个终端叶子,每个叶子对应于计算KCRV,不确定性和DoE的不同方法.
- 从CCQM-IAWG KC,放射性核素测量和热敏电阻功率传感器效率中提取的说明性示例.
主要成果:
- 决策树为选择合适的统计模型和数据缩小程序提供了一个结构化的方法.
- 它为计算KCRV,相关不确定性和等效度提供了五种不同的途径.
- 在各种计量学应用中证明了适用性,包括化学分析和物理测量.
结论:
- 决策树作为一个有价值的指南,而不是一个严格的决定因素,用于KC统计分析.
- 它支持科学家负责KCs的知情决策.
- 该工具具有广泛的适用性,不会使现有的计量结果或CMC无效.
相关概念视频
Multiple Comparison Tests
3.9K
Multiple comparison test, abbreviated as MCT, is a post hoc analysis generally performed after comparing multiple samples with one or more tests. An MCT will help identify a significantly different sample among multiple samples or a factor among multiple factors.
It would be easy to compare two samples using a significance alpha level of 0.05. In other words, there is only one sample pair to be compared. However, it would be difficult to identify a significantly different sample if the number...
It would be easy to compare two samples using a significance alpha level of 0.05. In other words, there is only one sample pair to be compared. However, it would be difficult to identify a significantly different sample if the number...
3.9K
Decision Making: P-value Method
5.3K
The process of hypothesis testing based on the P-value method includes calculating the P- value using the sample data and interpreting it.
First, a specific claim about the population parameter is proposed. The claim is based on the research question and is stated in a simple form. Further, an opposing statement to the claim is also stated. These statements can act as null and alternative hypotheses: a null hypothesis would be a neutral statement while the alternative hypothesis can...
First, a specific claim about the population parameter is proposed. The claim is based on the research question and is stated in a simple form. Further, an opposing statement to the claim is also stated. These statements can act as null and alternative hypotheses: a null hypothesis would be a neutral statement while the alternative hypothesis can...
5.3K
Evolutionary Relationships through Genome Comparisons
5.7K
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
5.7K
Survival Tree
78
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
Constructing a...
Building a Survival Tree
Constructing a...
78
Decision Making: Traditional Method
4.0K
The process of hypothesis testing based on the traditional method includes calculating the critical value, testing the value of the test statistic using the sample data, and interpreting these values.
First, a specific claim about the population parameter is decided based on the research question and is stated in a simple form. Further, an opposing statement to this claim is also stated. These statements can act as null and alternative hypotheses, out of which a null hypothesis would be a...
First, a specific claim about the population parameter is decided based on the research question and is stated in a simple form. Further, an opposing statement to this claim is also stated. These statements can act as null and alternative hypotheses, out of which a null hypothesis would be a...
4.0K
Comparing Experimental Results: Student's t-Test
1.5K
The t-test is a statistical method used to compare the sample mean with a population mean or compare two means from two data sets. The test statistic is calculated from the standard deviation, mean, and number of measurements in the data set at a selected confidence interval and then compared to a table of critical values at this confidence level. If the test statistic is smaller than the critical value, the null hypothesis is accepted. In this case, we state that the difference between the...
1.5K


