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Related Concept Videos

Naturalistic Observations02:30

Naturalistic Observations

If you want to understand how behavior occurs, one of the best ways to gain information is to simply observe the behavior in its natural context. However, people might change their behavior in unexpected ways if they know they are being observed. How do researchers obtain accurate information when people tend to hide their natural behavior? As an example, imagine that your professor asks everyone in your class to raise their hand if they always wash their hands after using the restroom. Chances...
Observational Studies01:11

Observational Studies

Observational studies are a type of analytical study where researchers observe events without any interventions. In other words, the researcher does not influence the response variable or the experiment's outcome.
There are three types of observational studies – Prospective, retrospective, and cross-sectional.
Prospective Study
Prospective studies, also known as longitudinal or cohort studies, are carried out by collecting future data from groups sharing similar characteristics. One example of...
Data Collection by Observations01:08

Data Collection by Observations

Data collection refers to a systematic way of obtaining, observing, measuring, and analyzing accurate information. Observational studies are one of the most widely used methods of data collection. It involves collecting data by observing the behavior and physical characteristics of a sample without making any modifications to the sample.
An astronomer viewing the motion and brightness of stars in the sky and recording the data is an example of observational data collection. A botanist recording...
Bias01:22

Bias

Bias refers to any tendency that prevents a question from being considered unprejudiced. In research, bias occurs when one outcome or answer is selected or encouraged over others in sampling or testing. Bias can occur during any research phase, including study design, data collection, analysis, and publication.
In statistics, a sampling bias is created when a sample is collected from a population, and some members of the population are not as likely to be chosen as others (remember, each member...
Archival Research01:40

Archival Research

Some researchers gain access to large amounts of data without interacting with a single research participant. Instead, they use existing records to answer various research questions. This type of research approach is known as archival research. Archival research relies on looking at past records or data sets to look for interesting patterns or relationships. For example, a researcher might access the academic records of all individuals who enrolled in college within the past ten years and...
Actor-Observer Effect01:23

Actor-Observer Effect

The actor-observer effect, a cognitive bias closely linked to the fundamental attribution error, refers to the tendency for individuals to attribute their behavior to external, situational factors while explaining others’ behavior in terms of internal, dispositional traits. This asymmetry in attribution significantly influences social perception and judgment.Cognitive Mechanisms Behind the EffectTwo primary psychological mechanisms contribute to the actor-observer effect: differences in visual...

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Measuring Light-Switching Behavior Using an Occupancy and Light Data Logger
05:50

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Published on: January 16, 2020

Some observations on observational research.

Robyn Bluhm1

  • 1Department of Philosophy and Religious Studies, Old Dominion University, Norfolk, VA 23529, USA. rbluhm@odu.edu

Perspectives in Biology and Medicine
|April 28, 2009
PubMed
Summary
This summary is machine-generated.

Evidence-based medicine (EBM) should re-evaluate its hierarchy of research methods. Nonrandomized studies offer valuable evidence when groups are comparable, challenging the strict ranking of randomized controlled trials (RCTs).

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Area of Science:

  • Medical research methodology
  • Evidence-based medicine (EBM)

Background:

  • The traditional hierarchy of evidence in EBM prioritizes randomized controlled trials (RCTs) and systematic reviews.
  • Nonrandomized studies are often placed lower, regardless of their design or comparability of groups.

Purpose of the Study:

  • To challenge the strict hierarchy of evidence in EBM.
  • To advocate for a more nuanced evaluation of research methods based on group comparability rather than randomization alone.

Main Methods:

  • Critically analyzing the principles of evidence-based medicine (EBM).
  • Proposing a continuum of study designs from 'clean' to pragmatic studies.
  • Highlighting the strengths of nonrandomized studies, such as longer duration and larger patient enrollment.

Main Results:

  • The similarity of treatment and control groups regarding confounding factors is more critical than randomization.
  • Nonrandomized studies possess characteristics beneficial for evidence generation, including scale and longevity.
  • A continuum model accommodates outcomes research and clinical database studies, currently excluded from the hierarchy.

Conclusions:

  • The EBM hierarchy should be revised to value comparable groups over strict randomization.
  • Nonrandomized studies offer significant, often overlooked, evidence for treatment safety and efficacy.
  • A pragmatic approach to study design and evidence evaluation is essential for real-world clinical application.