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34 cnvrt.coords<br />

Side Effects<br />

prints<br />

AUTHOR<br />

Frank Harrell<br />

Department of Biostatistics<br />

Vanderbilt University<br />

f.harrell@vanderbilt.edu<br />

References<br />

See Also<br />

Peterson B, George SL: Controlled Clinical Trials 14:511–522; 1993.<br />

cpower, spower<br />

Examples<br />

# Find the power of a race x treatment test. 25% of patients will<br />

# be non-white and the total sample size is 14000.<br />

# Accrual is for 1.5 years and minimum follow-up is 5y.<br />

# Reduction in 5-year mortality is 15% for whites, 0% or -5% for<br />

# non-whites. 5-year mortality for control subjects if assumed to<br />

# be 0.18 for whites, 0.23 for non-whites.<br />

n

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