@prefix n9j: <http://data.loterre.fr/ark:/67375/N9J> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix isothes: <http://purl.org/iso25964/skos-thes#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .

n9j: a skos:ConceptScheme .
n9j:-methods
  a isothes:ConceptGroup ;
  skos:prefLabel "methods"@en ;
  skos:member n9j:-KW9FB592-9 .

n9j:-C8NQZ4GL-J
  skos:prefLabel "statistics and research methods"@en ;
  a skos:Concept ;
  skos:narrower n9j:-KW9FB592-9 .

n9j:-KW9FB592-9
  owl:sameAs <https://concepts.sagepub.com/social-science/concept/observational_studies> ;
  skos: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]"@en ;
  a skos:Concept ;
  skos:inScheme n9j: ;
  skos:broader n9j:-C8NQZ4GL-J ;
  skos:prefLabel "observational studies"@en .