TY  - GEN
AU  - Lee,J W
AU  - DeMets,D L
TI  - Group sequential comparison of changes: ad-hoc versus more exact method
SN  - 0006-341X
PY  - 1995///0630
KW  - Analysis of Variance
KW  - Biometry
KW  - methods
KW  - Clinical Trials as Topic
KW  - Humans
KW  - Models, Statistical
KW  - National Institutes of Health (U.S.)
KW  - United States
N1  - Publication Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S
ER  -