TY  - GEN
AU  - Hirsch,R P
TI  - Validation samples
SN  - 0006-341X
PY  - 1992///0114
KW  - Humans
KW  - Models, Statistical
KW  - Multivariate Analysis
KW  - Research
KW  - standards
KW  - Research Design
N1  - Publication Type: Letter
ER  -