TY  - RPRT
TI  - Statistics notes: variables and parameters.
AU  - D G Altman
AU  - J M Bland
PY  - 1999
DO  - 10.1136/bmj.318.7199.1667
UR  - https://pubmed.ncbi.nlm.nih.gov/10373171/
ID  - 10373171
ER  -