@misc{indiciaee0309bd5f8fd,
  title = {Statistics notes. Units of analysis.},
  author = {D G Altman and J M Bland},
  year = {1997},
  doi = {10.1136/bmj.314.7098.1874},
  url = {https://pubmed.ncbi.nlm.nih.gov/9224131/},
  note = {Source identifier: 9224131}
}