ESPRESSO (Estimating Sample-size and Power in R by Exploring Simulated Study Outcomes) is a simulation based tool, written in the R language that supports power and sample size calculations for stand-alone studies and analyses nested in cohort studies. The large number of participants required for adequately powered studies are quite expensive so it is important that an accurate sample size is identified.
- Linux / Windows
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ESPRESSO: taking into account assessment errors on outcome and exposures in power analysis for association studies.
Gaye A, Burton TW, Burton PR.
Bioinformatics. 2015 Apr 22. pii: btv219.