DeMets, D L <br/><br/>
Use of logrank tests and group sequential methods at fixed calendar times.  [electronic resource] 

 -  Biometrics  Dec 1985 
 - 1039-44 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S. 
<br/><br/><label>ISSN: </label>0006-341X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biometry<br/>Clinical Trials as Topic--methods<br/>Humans<br/>Mortality<br/>Probability<br/>Time Factors