TY  - RPRT
TI  - Unnecessary stratification/pairing can never increase efficiency--a mathematical proof.
AU  - B G Choi
PY  - 1984
DO  - 10.1093/ije/13.1.116
UR  - https://pubmed.ncbi.nlm.nih.gov/6698696/
ID  - 6698696
ER  -