TY  - GEN
AU  - DeMets,D L
AU  - Gail,M H
TI  - Use of logrank tests and group sequential methods at fixed calendar times
SN  - 0006-341X
PY  - 1986///0512
KW  - Biometry
KW  - Clinical Trials as Topic
KW  - methods
KW  - Humans
KW  - Mortality
KW  - Probability
KW  - Time Factors
N1  - Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S
ER  -