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

n9j:-S0W3KW8V-X
  owl:sameAs <https://concepts.sagepub.com/social-science/concept/longitudinal_research_design> ;
  skos:definition "In epidemiology, a longitudinal study refers to the collection of data from the same unit (e.g., the same person) at two or more different points in time. The great advantage of longitudinal studies is that each subject serves as his or her own control in the study of change across time. [Source: Encyclopedia of Epidemiology; Longitudinal Research Design]"@en ;
  a skos:Concept ;
  skos:inScheme n9j: ;
  skos:broader n9j:-C8NQZ4GL-J ;
  skos:prefLabel "longitudinal research design"@en .

n9j:-methods
  a isothes:ConceptGroup ;
  skos:prefLabel "methods"@en ;
  skos:member n9j:-S0W3KW8V-X .

n9j:-C8NQZ4GL-J
  skos:prefLabel "statistics and research methods"@en ;
  a skos:Concept ;
  skos:narrower n9j:-S0W3KW8V-X .

n9j: a skos:ConceptScheme .