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Related Concept Videos

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
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Blinding01:11

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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.
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Clinical Trials01:16

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Clinical trials are prospective experimental studies conducted on humans to determine the safety and efficacy of treatments, drugs, diet methods, and medical devices. Using statistics in clinical trials enables researchers to derive reasonable and accurate conclusions from the collected data, allowing them to make wise decisions in uncertain situations. In medical research, statistical methods are crucial for preventing errors and bias.
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Group Design02:01

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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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Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
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Random Sampling Method01:09

Random Sampling Method

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Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest. Among the various sampling methods used by...
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Related Experiment Video

Updated: Jun 30, 2025

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
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Choosing and evaluating randomisation methods in clinical trials: a qualitative study.

Cydney L Bruce1, Mais Iflaifel2, Alan Montgomery2

  • 1Nottingham Clinical Trials Unit, School of Medicine, University of Nottingham, Nottingham, UK. cydney.bruce1@nottingham.ac.uk.

Trials
|March 21, 2024
PubMed
Summary
This summary is machine-generated.

Researchers choose randomisation methods based on trial needs, but unit standards and differing views on balance and predictability cause variation. More guidance is needed for selecting randomisation methods in clinical trials.

Keywords:
Focus groupsQualitativeRCTsRandomisation

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Area of Science:

  • Clinical Trials Methodology
  • Randomisation Techniques
  • Qualitative Research

Background:

  • Significant variation exists in randomisation method selection for clinical trials, beyond explained trial characteristics.
  • Researcher motivations and evaluation criteria for randomisation methods require deeper exploration.

Purpose of the Study:

  • To qualitatively explore researchers' motivations for choosing specific randomisation methods.
  • To understand how researchers evaluate the performance of different randomisation techniques.

Main Methods:

  • Online focus groups conducted with 25 stakeholders from 20 UK clinical trials units.
  • Verbatim transcription of focus group discussions followed by thematic analysis.

Main Results:

  • Four key themes emerged: selection criteria, method opinions, desirable features, and performance measurement.
  • Most researchers select methods based on trial characteristics, but unit standards often dictate practice.
  • Opinions varied, with preferences for stratified blocks or minimisation driven by perceived balance and predictability; predictability was often prioritised.

Conclusions:

  • Divergent practices in randomisation method selection stem from differing unit standards and priorities for balance versus predictability.
  • The study highlights a need for enhanced guidance on selecting appropriate randomisation methods in clinical trials.