TY  - GEN
AU  - Demets,D L
TI  - Group sequential procedures: calendar versus information time
SN  - 0277-6715
PY  - 1989///1221
KW  - Algorithms
KW  - Chronology as Topic
KW  - Clinical Protocols
KW  - standards
KW  - Clinical Trials as Topic
KW  - Computer Simulation
KW  - Data Collection
KW  - Group Structure
N1  - Publication Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S
UR  - https://doi.org/10.1002/sim.4780081003
ER  -