@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix isothes: <http://purl.org/iso25964/skos-thes#> .

<https://concepts.sagepub.com/social-science/concept/conceptgroup/methods>
  a skos:Collection, isothes:ConceptGroup ;
  skos:prefLabel "methods"@en ;
  skos:member <https://concepts.sagepub.com/social-science/concept/observational_studies> .

<https://concepts.sagepub.com/social-science/concept/statistics_and_research_methods>
  skos:prefLabel "statistics and research methods"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/observational_studies> .

<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: <a href=\"https://methods.sagepub.com/reference/encyc-of-epidemiology/n327.xml\" target=\"_blank\" data-id=\"to-srm\">Encyclopedia of Epidemiology; Observational Studies</a>]"@en ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/statistics_and_research_methods> ;
  skos:prefLabel "observational studies"@en ;
  a skos:Concept .