title: Statistical methods in research.
authors.forename: E R
authors.initials: ER
authors.lastname: Greenberg
authors.forename: T A
authors.initials: TA
authors.lastname: Stukel
authors.forename: J A
authors.initials: JA
authors.lastname: Baron
authors.forename: D H
authors.initials: DH
authors.lastname: Freeman
mesh_terms: D000367:Age Factors; D015986:Confounding Factors, Epidemiologic; D006801:Humans; D007348:Insurance, Health; D016015:Logistic Models; D008175:Lung Neoplasms / Q000532:radiotherapy / Q000601:surgery; D008393:Marriage; D015233:Models, Statistical; D011336:Probability