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An expert system for the calculation of sample size

M H Ebell1, A V Neale, B J Hodgkins

  • 1Department of Family Medicine, Wayne State University School of Medicine, Detroit, Michigan 48201.

Family Practice Research Journal
|June 1, 1994
PubMed
Summary

Calculating study sample sizes is crucial for researchers and clinicians. A free software, Sample Size Expert, simplifies this process for various study types using an expert system.

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Area of Science:

  • Biostatistics
  • Research Methodology

Background:

  • Accurate sample size calculation is essential for robust study design and reliable interpretation of research findings.
  • Key statistical elements influencing sample size include alpha, beta, Type I and Type II errors, and confidence levels.
  • Inexperienced researchers often face challenges in performing precise sample size calculations.

Purpose of the Study:

  • To introduce a user-friendly software tool, Sample Size Expert, for simplifying sample size calculations.
  • To assist researchers and clinicians in determining appropriate sample sizes for both analytic and descriptive studies.
  • To provide a free, accessible resource for improving the quality of research design and data interpretation.

Main Methods:

  • Development of a computer software program, Sample Size Expert.
  • Implementation of an expert system within the software to guide users through the calculation process.
  • Inclusion of essential statistical parameters such as alpha, beta, error types, and confidence intervals in the calculation logic.

Main Results:

  • The Sample Size Expert software effectively facilitates sample size calculations for diverse study designs.
  • The expert system aids users, particularly those with less experience, in navigating complex statistical requirements.
  • The software is readily available at no cost, promoting wider accessibility for the research community.

Conclusions:

  • Sample Size Expert is a valuable, free tool for researchers and clinicians needing to determine study sample sizes.
  • The software enhances research design by simplifying the accurate calculation of sample sizes.
  • Accessible sample size calculation tools can improve the rigor and interpretability of scientific research.

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