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相关概念视频

Sample Size Calculation01:19

Sample Size Calculation

3.8K
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...
3.8K
One-Way ANOVA: Equal Sample Sizes01:15

One-Way ANOVA: Equal Sample Sizes

3.5K
One-Way ANOVA can be performed on three or more samples with equal or unequal sample sizes. When one-way ANOVA is performed on two datasets with samples of equal sizes, it can be easily observed that the computed F statistic is highly sensitive to the sample mean.
Different sample means can result in different values for the variance estimate: variance between samples. This is because the variance between samples is calculated as the product of the sample size and the variance between the...
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What are Populations and Communities?00:30

What are Populations and Communities?

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Overview
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One-Way ANOVA: Unequal Sample Sizes01:15

One-Way ANOVA: Unequal Sample Sizes

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One-way ANOVA can be performed on three or more samples of unequal sizes. However, calculations get complicated when sample sizes are not always the same. So, while performing ANOVA with unequal samples size, the following equation is used:
5.9K
Conservation of Small Populations02:04

Conservation of Small Populations

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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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Sampling Plans01:23

Sampling Plans

274
Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
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相关实验视频

Updated: Sep 12, 2025

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
07:41

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

Published on: July 30, 2019

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对物种共发生模型的样本大小考虑.

Amber Cowans1, Albert Bonet Bigatà2, Chris Sutherland1

  • 1Centre for Research into Ecological and Environmental Modelling, School of Mathematics and Statistics, University of St Andrews, St Andrews, Scotland, UK.

Ecology
|August 8, 2025
PubMed
概括
此摘要是机器生成的。

多物种占用模型需要大量的数据集来准确地推断共发生. 对于物种相互作用的可靠检测,需要足够的地点,特别是对于弱的同时发生模式.

关键词:
摄像头陷的捕捉方式多种物种占用模型.占用率建模的使用情况.受到惩罚的可能性.动力分析分析能力分析两种物种的同时出现.种类的相互作用 物种的相互作用

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Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates
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Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates

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Integrating Remote Sensing with Species Distribution Models; Mapping Tamarisk Invasions Using the Software for Assisted Habitat Modeling SAHM
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Integrating Remote Sensing with Species Distribution Models; Mapping Tamarisk Invasions Using the Software for Assisted Habitat Modeling SAHM

Published on: October 11, 2016

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相关实验视频

Last Updated: Sep 12, 2025

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07:41

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

Published on: July 30, 2019

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Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates
08:56

Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates

Published on: January 13, 2023

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12:26

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科学领域:

  • 生态生态学 生态生态学
  • 统计建模 统计建模

背景情况:

  • 多物种占用模型对于理解物种相互作用至关重要.
  • 收和估计问题通常出现在有限的样本大小.

研究的目的:

  • 评估新模型在不同样本大小和相互作用强度下估计共发生的能力.
  • 评估模型复杂度 (物种和共变量数) 对估计准确性的影响.

主要方法:

  • 模拟研究检查最近开发的多种物种占用模型.
  • 采用了标准概率方法和处罚概率方法.
  • 多样化的样本大小,检测概率,相互作用强度和模型复杂性.

主要成果:

  • 模型性能对样本大小,检测概率和相互作用强度高度敏感.
  • 同时发生的高偏差估计发生在<100个地点 (高检测) 或400-1000个地点 (低检测).
  • 强烈的共同发生在>200个站点 (高检测) 中是可检测的,但即使在大型数据集中也很少检测到弱共同发生.

结论:

  • 可靠地推断物种的共同存在需要比目前常见的数据集大得多.
  • 占用模式通常对样本大小具有稳定性,但同时发生的推断不是.
  • 该模型可以量化强烈的并发现象,并预测较大的数据集的占用率,但建议小数据集或弱相互作用时谨慎使用.