TY  - BOOK
AU  - Everitt,Brian S.
TI  - Modern medical statistics: a practical guide 
SN  - 0340808691
PY  - 2003///
CY  - London
PB  - Arnold
KW  - Statistics
KW  - methods
KW  - Biomedical Research
N1  - References : p. 220-228
ER  -