将CWM方法扩展到种内特征变异:如何处理过于乐观的标准测试?
David Zelený1, Kenny Helsen2, Yi-Nuo Lee2
1Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei City, Taiwan. zeleny@ntu.edu.tw.
Oecologia
|May 28, 2024
概括
标准的统计测试增加了社区级功能特征 (CWM) 和环境关系的I型错误. 扩展换试验 (最大试验) 纠正了特定地点CWM的错误,并且对内部CWM准确.
科学领域:
- 生态生态学 生态生态学
- 基于特征的生态学
- 统计生态学 统计生态学
背景情况:
- 社区加权平均值 (CWM) 将社区特征与环境因素联系起来.
- 标准的统计测试 (例如线性回归,ANOVA) 可以在CWM环境分析中增加I型错误率.
- 变换测试,就像最大测试一样,可以纠正这些膨胀的错误率.
研究的目的:
- 调查CWM与环境之间的特定地点和特定物种内部关系的I型错误率.
- 开发和验证一种新的统计测试,以计算种内特征变化 (ITV).
主要方法:
- 使用了模拟和真实世界的社区数据集.
- 通过使用标准参数测试,分析了特定地点和特定物种内CWM的I型错误率.
- 开发并应用ITV扩展的CWM环境关系的最大测试.
主要成果:
- 网站特定的CWM环境关系显示了膨胀的I型错误,与ITV大小负相关.
- 内部特定的CWM环境关系在标准测试中表现出正确的I型错误率.
- ITV扩展的最大测试有效地纠正不同ITV的特定站点CWM的膨胀型I错误.
结论:
- 标准测试对于特定地点的CWM-环境关系是不可靠的,原因是膨胀的I型错误.
- ITV扩展的最大测试为分析CWM环境关系提供了强大的解决方案,特别是与重要的ITV.
- 由于未解决的I型错误通货膨胀,已发表的研究可能会夸大其重要性.
相关概念视频
Behavioral Genetics and Its Designs
353
Behavior genetics explores how genetic inheritance influences human behavior. It focuses on how genes, passed from parents to offspring, contribute to the development of behavioral traits and tendencies. This branch of genetics seeks to understand the complex interplay between inherited genetic factors and environmental influences in shaping our behaviors.
The primary methodologies used in behavior genetics include family studies, twin studies, and adoption studies, each providing unique...
The primary methodologies used in behavior genetics include family studies, twin studies, and adoption studies, each providing unique...
353
Heritability
196
Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic"...
196
Limits to Natural Selection
31.2K
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
31.2K
Background and Environment Affect Phenotype
6.5K
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
6.5K
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
Crossover Experiments
2.8K
Crossover experiments, also called the repeated-measurements design, is a study design in which all experimental units are exposed to all treatments in different periods. Crossover experiments are generally used in psychology, the pharmaceutical industry, agriculture, and medicine.
Crossover designs are performed even with smaller sample sizes since the samples can act as their controls. These are better than simple randomized trials since patients are exposed to all the treatments.
Crossover designs are performed even with smaller sample sizes since the samples can act as their controls. These are better than simple randomized trials since patients are exposed to all the treatments.
2.8K


