Spurious effects from an extraneous variable

J Chronic Dis. 1966 Jun;19(6):637-47. doi: 10.1016/0021-9681(66)90062-2.
No abstract available

MeSH terms

  • Accidents, Traffic*
  • Humans
  • Language
  • Lung Neoplasms / etiology
  • Mathematics
  • Research
  • Smoking*