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Viera, Anthony J. "Odds ratios and risk ratios: what's the difference and why does it matter?." *Southern medical journal* 101.7 (2008): 730-734.

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There is an online Handbook of Biological Statistics which has an excellent overview of power analysis.

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Eng, John. "Sample Size Estimation: How Many Individuals Should Be Studied? 1." *Radiology* 227.2 (2003): 309-313.