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Causality and control: threats to internal validity

R Behi, M Nolan

British Journal of Nursing (Mark Allen Publishing)

|March 10, 1996

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Understanding threats to internal validity is crucial for establishing causal relationships in experimental research. This article identifies 13 common threats, offering examples to aid in their recognition and control.

Area of Science:

Experimental research methodology
Causal inference
Research design

Background:

Establishing causal relationships is fundamental to experimental research.
Internal validity, the extent to which a study can rule out alternative explanations for its findings, is essential for causal inference.
Numerous factors, known as threats, can compromise internal validity.

Purpose of the Study:

To identify and describe key threats to internal validity in experimental research.
To provide illustrative examples for each threat to enhance understanding and recognition.
To guide researchers in controlling extraneous variables and strengthening causal claims.

Main Methods:

Literature review and synthesis of established threats to internal validity.

Related Experiment Videos

Categorization of 13 distinct threats.

Development of practical examples to demonstrate threat occurrence.

Main Results:

Identification of 13 specific threats to internal validity.
Detailed explanations and examples for each threat, including history, maturation, testing, instrumentation, statistical regression, selection, mortality, and interactions.
Discussion of threats related to treatment diffusion, compensatory equalization, compensatory rivalry, and resentful demoralization.

Conclusions:

Recognizing and mitigating threats to internal validity is critical for the integrity of experimental research.
Careful experimental design and control of extraneous variables are necessary to ensure accurate causal conclusions.
This article serves as a resource for researchers to improve the internal validity of their studies.