title: Invited commentary: ecologic biases.
authors.affiliation: Johns Hopkins Oncology Center, Baltimore, MD 21206.
authors.forename: S
authors.initials: S
authors.lastname: Piantadosi
mesh_terms: D015982:Bias; D004463:Ecology; D015987:Effect Modifier, Epidemiologic; D004812:Epidemiologic Methods; D006801:Humans; D016014:Linear Models; D008452:Maximum Allowable Concentration; D015203:Reproducibility of Results