TY  - JOUR
TI  - Assignment to Treatment Group on the Basis of a Covariate
AU  - Donald B. Rubin
JO  - Journal of Educational Statistics
PY  - 1977
VL  - 2
IS  - 1
DO  - 10.3102/10769986002001001
UR  - https://doi.org/10.3102/10769986002001001
ER  -