Hi All: I am writing a study protocol aimed to compare a new screening technique called "electromammography" with conventional methods of screening for breast cancer. Would highly appreciate if anyone can provide some wisdom whether there exists a way to calculate the study power and sample size for situations where two or more screening methods are being compared TIA, Arin Arindam Basu MD MPH ENT Surgeon and Healthcare Research Analyst Contact: 91-33-4759824, 474 2225 (India) 1-877-778-3400*558 (USA) URL: http://www.geocities.com/arinbasu99/resu2000.html ______________________________________________ FREE Personalized Email at Mail.com Sign up at http://www.mail.com/?sr=signup