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Statistical power: concepts, procedures, and applications

M Hallahan1, R Rosenthal

  • 1Department of Psychology, Harvard University, Cambridge, MA 02138, USA.

Behaviour Research and Therapy
|May 1, 1996
PubMed
Summary
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Statistical power is crucial for psychological research. Neglecting statistical power can lead to serious consequences, so researchers should consider it during study planning and interpretation.

Area of Science:

  • Psychological Research Methods
  • Statistical Inference

Background:

  • Statistical power is frequently overlooked in psychological research.
  • Neglecting power can lead to significant consequences in study outcomes.

Purpose of the Study:

  • To explicate the concept of statistical power.
  • To provide actionable suggestions for enhancing statistical power in psychological investigations.

Main Methods:

  • Conceptual analysis of statistical power.
  • Review of implications for research design and interpretation.

Main Results:

  • Statistical power is defined as the probability of correctly rejecting a false null hypothesis.
  • Underpowered studies risk failing to detect true effects.

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Conclusions:

  • Statistical power is a fundamental consideration for both the planning and interpretation phases of research.
  • Researchers are encouraged to implement strategies to increase the power of their studies.