Calculating Sample Sizes

Table of Contents

FAQ
Glossary of Terms
Study Descriptions
      One-Stage
      Two-Stage: stop early to conclude either H0 or H1
      Two-Stage: stop early only to conclude H0
      Two-Stage: stop early only to conclude H1
      Three-Stage: stop early to conclude either H0 or H1
      Three-Stage: stop early only to conclude H0
      Three-Stage: stop early only to conclude H1
      Two Sample Two-Stage: stop early to conclude either H0 or H1
      Two Sample Two-Stage: stop early only to conclude H0
      Two Sample Two-Stage: stop early only to conclude H1

Frequently Asked Questions

The sample size recommendations made on this site are all based on research done by Dr. James L. Kepner. For more information about discrete group sequential methods, see, for example, Jennison, C. and Turnbull, B.W. (2000), Group Sequential Methods with Applications to Clinical Trials, Chapman & Hall / CRC.

Who may use the results of these programs?

Please feel free to make use of the sample size calculator in your practice or research.

Whom can I contact if the sample size calculator will not work?

Although on-line user support is not currently available for this application, comments, suggestions, and corrections may be forwarded to Dr. James L. Kepner, Ph.D.

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Glossary of Terms

* Please note that an understanding of additional terms may be necessary in order to comprehend the statistical analysis done on this site.

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Study Descriptions

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