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相关概念视频

Randomized Experiments01:13

Randomized Experiments

6.8K
The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...
6.8K
Group Design02:01

Group Design

8.9K
The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between...
8.9K
Censoring Survival Data01:09

Censoring Survival Data

72
Survival analysis is a statistical method used to analyze time-to-event data, often employed in fields such as medicine, engineering, and social sciences. One of the key challenges in survival analysis is dealing with incomplete data, a phenomenon known as "censoring." Censoring occurs when the event of interest (such as death, relapse, or system failure) has not occurred for some individuals by the end of the study period or is otherwise unobservable, and it might have many different...
72
Blinding01:11

Blinding

2.4K
Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
2.4K
Strategies for Assessing and Addressing Confounding01:25

Strategies for Assessing and Addressing Confounding

86
Confounding is a critical issue in epidemiological studies, often leading to misleading conclusions about associations between exposures and outcomes. It occurs when the relationship between the exposure and the outcome is mixed with the effects of other factors that influence the outcome. Given that, addressing confounding is of high importance for drawing accurate inferences in research.
Confounding can be addressed at both the design phase of a study and through analytical methods after data...
86
Blind Procedures02:07

Blind Procedures

10.6K
Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
10.6K

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相关实验视频

Updated: Jun 13, 2025

Measuring Delay Discounting in Humans Using an Adjusting Amount Task
07:47

Measuring Delay Discounting in Humans Using an Adjusting Amount Task

Published on: January 9, 2016

15.3K

组响应 - 适应性随机化与延迟和缺失的响应.

Guannan Zhai1, Yang Li2, Lixin Zhang3,4

  • 1Department of Statistics, George Washington University, Washington, DC.

Statistics in medicine
|September 16, 2024
PubMed
概括
此摘要是机器生成的。

这项研究为临床试验引入了一种新的群体响应适应性随机化 (RAR) 方法,通过更新基于群体响应而不是个人响应的分配来提高实用性. 新型设计保持了理论性质,并且在延迟或缺失数据的情况下表现良好.

关键词:
具有非对称的属性.临床试验临床试验临床试验临床试验临床试验具有双重适应性的偏见硬币设计.有效的高效的高效.团队招生 团队招生顺序设计的设计.

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Testing for Metacognitive Responding Using an Odor-based Delayed Match-to-Sample Test in Rats
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Testing for Metacognitive Responding Using an Odor-based Delayed Match-to-Sample Test in Rats

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Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment
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Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment

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相关实验视频

Last Updated: Jun 13, 2025

Measuring Delay Discounting in Humans Using an Adjusting Amount Task
07:47

Measuring Delay Discounting in Humans Using an Adjusting Amount Task

Published on: January 9, 2016

15.3K
Testing for Metacognitive Responding Using an Odor-based Delayed Match-to-Sample Test in Rats
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Testing for Metacognitive Responding Using an Odor-based Delayed Match-to-Sample Test in Rats

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Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment
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Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment

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科学领域:

  • 临床试验 临床试验
  • 生物统计学 生物统计学
  • 医学研究方法学 医学研究方法学

背景情况:

  • 传统的响应适应性随机化 (RAR) 在每个患者响应后更新了分配,在许多临床环境中提出了实际挑战.
  • 现有的RAR方法经常因患者反应数据延迟或缺失而困难,限制了它们在现实世界中的适用性.

研究的目的:

  • 为临床试验提出一系列新的群体响应适应性随机化 (RAR) 程序.
  • 通过引入基于组的更新来解决基于个人响应的RAR的不切实际性.
  • 评估拟议的组RAR设计的性能和理论特性,特别是在数据延迟或丢失的场景中.

主要方法:

  • 开发一种新的群体响应适应性随机化程序,根据患者总体响应更新分配.
  • 对拟议设计的理论特性进行分析,并将其与现有的双适应性偏见硬币设计 (DBCD) 进行比较.
  • 数字模拟用于在各种条件下评估性能,包括延迟和随机丢失的响应.

主要成果:

  • 拟议的组双适应偏见硬币设计 (DBCD) 保持了与现有的DBCD相似的基本理论特性.
  • 组RAR设计在涉及延迟和随机缺失患者反应的模拟中显示出强大的性能.
  • 在真正的临床试验中成功地应用了新组RAR设计,展示了其实用性和优势.

结论:

  • 拟议的群体响应适应性随机化为临床试验中基于个体响应的RAR提供了一个实用和有效的替代方案.
  • 该组RAR设计适用于处理延迟和缺失响应数据,提高试验效率.
  • 这些发现支持在临床研究中更广泛地应用群体响应适应性设计.