TY  - RPRT
TI  - Statistics notes. Units of analysis.
AU  - D G Altman
AU  - J M Bland
PY  - 1997
DO  - 10.1136/bmj.314.7098.1874
UR  - https://pubmed.ncbi.nlm.nih.gov/9224131/
ID  - 9224131
ER  -