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相关概念视频

Randomized Experiments01:13

Randomized Experiments

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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...
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Crossover Experiments01:16

Crossover Experiments

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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.
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Experimental Designs01:16

Experimental Designs

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An experimental design is a systematic process that allows researchers to evaluate the relationship between dependent and independent variables. There are three widely used types of experimental design - pre-experimental design, true experimental design, and quasi-experimental design. In pre-experimental design, the researcher compares the data before and after some interventions or treatments. The true-experimental design has more than one purposefully created group, a commonly measured...
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Study Designs in Epidemiology

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Epidemiological study designs are fundamental tools for investigating the distribution, determinants, and control of health conditions in populations. They help researchers understand the relationships between exposures and outcomes, and they broadly fall into two categories: "observational" and "experimental" studies.
Observational studies are those where the researcher does not intervene but rather observes natural variations. They include cross-sectional, cohort, and...
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Group Design02:01

Group Design

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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...
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Study Design in Statistics

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A study design is a set of techniques that allow a researcher to collect and analyze data from different variables defined for a specific research problem. Statistics is commonly for effective study design and more robust experiments,
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相关实验视频

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The Innovation Arena: A Method for Comparing Innovative Problem-Solving Across Groups
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集群随机试验设计用于建模时间变化的干预效应.

Kenneth Menglin Lee1, Yin Bun Cheung1,2,3

  • 1Centre for Quantitative Medicine, Duke-NUS Medical School, Singapore, Singapore.

Statistics in medicine
|November 10, 2023
PubMed
概括

步集群随机试验 (SW-CRTs) 当干预效应随着时间的推移而变化时,可以产生偏差的结果. 像基线平行CRT (PB-CRT) 这样的替代设计提供了更有效的时间干预 (TOI) 效应估计.

关键词:
集群随机试验是指集群的随机试验.暴露时间暴露时间.阶段形试验的阶段性形试验.差异差异是指差异的差异.

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科学领域:

  • 临床试验方法论 临床试验方法论
  • 生物统计学 生物统计学
  • 医疗保健服务研究 医疗服务研究

背景情况:

  • 阶梯集群随机试验 (SW-CRTs) 经常假设持续的干预效应,如果效应随着暴露时间的变化而变化,这可能导致偏差.
  • 在SW-CRT中进行干预时间 (TOI) 影响估计,可以解释干预效应的变化,但由于异构分类差异,面临挑战.

研究的目的:

  • 为了比较不同集群随机试验 (CRT) 设计在估计时间干预 (TOI) 效果方面的效率.
  • 为了评估SW-CRT,并行CRT (P-CRT),与基线并行CRT (PB-CRT) 和与基线并行CRT和全暴露期 (PBAE-CRT) 的性能,用于TOI效应建模.

主要方法:

  • 在不同CRT设计中推导和比较TOI效应的方差估计器.
  • 与恒定效应模型相比,P-CRT和PB-CRT的相同时间平均TOI效应变异和点估计器的证明.
  • 模拟研究使用来自医院撤资研究的数据来比较TOI效应估计.

主要成果:

  • 该SW-CRT显示为早期TOI效应的最有效估计器.
  • 一般来说,PB-CRT为长期和时间平均 TOI 影响提供了最有效的估计器.
  • 时间平均的TOI效应估计器相当于P-CRT和PB-CRT中的恒定效应模型.

结论:

  • 当结合TOI效应时,PB-CRT设计是建模随时间变化的干预效应的更合适选择.
  • 选择合适的CRT设计对于准确估计时间变化的干预效应至关重要.
  • 这些发现为优化基于预期干预效应性质的CRT设计选择提供了指导.