G*Power Software Available for free download at the G*Power website
Jim says: There are lots of software options for sample size calculation depending on your needs. G*Power does the job for a wide range of scenarios with a minimum of effort.
Julious, S. A. Sample Size for Clinical Trials @USyd library
Jim says: Clinical trials often involve testing variations on the classic hypothesis of a difference between groups. The research question in a clinical trial might require a test of “equivalence”, “superiority” or “non-inferiority”, for example. This book by Julious sets out how to handle each option, including useful worked examples.
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