title: A revised SAS macro for maximum likelihood estimation of prevalence ratios using the COPY method.
authors.forename: M R
authors.initials: MR
authors.lastname: Petersen
authors.forename: J A
authors.initials: JA
authors.lastname: Deddens
mesh_terms: D006801:Humans; D015233:Models, Statistical; D009784:Occupational Diseases / Q000453:epidemiology*; D015995:Prevalence