Control of Extraneous Factors

  • David G. Kleinbaum
  • Kevin M. Sullivan
  • Nancy D. Barker


Suppose we are studying whether there is a link between exposure to a toxic chemical and the development of lung cancer in a chemical industry. To answer this question properly, we would want to isolate the effect of the chemical from the possible influence of other variables, particularly age and smoking status, two known risk factors for lung cancer. That is, our goal is to determine whether or not exposure to the chemical contributes anything over and above the effects of age and smoking to the development of lung cancer.


Smoking Status Logistic Model Stratify Analysis Product Term Exposure Variable 
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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • David G. Kleinbaum
    • 1
  • Kevin M. Sullivan
    • 2
  • Nancy D. Barker
    • 3
  1. 1.Rollins School of Public HealthEmory UniversityAtlantaUSA
  2. 2.Department of Epidemiology Rollins School of Public HealthEmory UniversityAtlantaUSA
  3. 3.AlpharettaUSA

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