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The Just-About-Right Pilot Sample Size to Control the Error Margin

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  • Scholastica C. Obodo
  • Deirdre Toher
  • Paul White

Abstract

In practice, the required sample size for a two-arm randomised controlled trial cannot always be determined pre-study with great accuracy. This lack of accuracy has economic, ethical and scientific implications. The sample size for a pilot study is an important consideration in helping the decision making for the sample size of a follow-on trial. Consideration of under- and over-estimation of the sample size results in the idea of a Just-About-Right (JAR) sample size. For studies involving a minimally clinical important difference (MCID) we present the pilot sample sizes to meet investigator desired JAR considerations.

Suggested Citation

  • Scholastica C. Obodo & Deirdre Toher & Paul White, 2025. "The Just-About-Right Pilot Sample Size to Control the Error Margin," International Journal of Statistics and Probability, Canadian Center of Science and Education, vol. 12(3), pages 1-1, January.
    • Handle: RePEc:ibn:ijspjl:v:12:y:2025:i:3:p:1
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    JEL classification:

    • R00 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General - - - General
    • Z0 - Other Special Topics - - General

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