methods
type: Collection
type: ConceptGroup
member: observational studies

statistics and research methods
type: Concept
narrower: observational studies

observational studies
definition: Observational epidemiology refers to the branch of epidemiology devoted to using nonexperimental studies to describe the health status of populations and generate evidence about determinants of health outcomes. Experimental designs in epidemiology, generally referred to as clinical trials, involve assignment of the principal independent variable, the “treatment,” to subjects. [Source: Encyclopedia of Epidemiology; Observational Studies]
broader: statistics and research methods
type: Concept