@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/sampling_error>
  skos:prefLabel "sampling error"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/longitudinal_research> .

<https://concepts.sagepub.com/social-science/concept/retrospective_data>
  skos:prefLabel "retrospective data"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/longitudinal_research> .

<https://concepts.sagepub.com/social-science/concept/attrition>
  skos:prefLabel "attrition"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/longitudinal_research> .

<https://concepts.sagepub.com/social-science/concept/panel_data>
  skos:prefLabel "panel data"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/longitudinal_research> .

<https://concepts.sagepub.com/social-science/concept/studies_of_aging>
  skos:prefLabel "studies of aging"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/longitudinal_research> .

<https://concepts.sagepub.com/social-science/concept/research_design>
  skos:prefLabel "research design"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/longitudinal_research> .

<https://concepts.sagepub.com/social-science/concept/prospective_data>
  skos:prefLabel "prospective data"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/longitudinal_research> .

<https://concepts.sagepub.com/social-science/concept/qualitative_data_collection>
  skos:prefLabel "qualitative data collection"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/longitudinal_research> .

<https://concepts.sagepub.com/social-science/concept/longitudinal_research>
  skos:definition "Longitudinal studies are those in which measurement occurs at more than one point in time. These can use qualitative, quantitative, or a combination of methods. [Source: <a href=\"https://sk.sagepub.com/reference/aging/n160.xml\" target=\"_blank\" data-id=\"to-sk\">Encyclopedia of Health &amp; Aging; Longitudinal Research</a>]"@en ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/law_and_society_research>, <https://concepts.sagepub.com/social-science/concept/qualitative_data_collection>, <https://concepts.sagepub.com/social-science/concept/research_design>, <https://concepts.sagepub.com/social-science/concept/studies_of_aging>, <https://concepts.sagepub.com/social-science/concept/statistics,_research_methods,_and_measurement> ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/panel_data>, <https://concepts.sagepub.com/social-science/concept/attrition>, <https://concepts.sagepub.com/social-science/concept/retrospective_data>, <https://concepts.sagepub.com/social-science/concept/prospective_data>, <https://concepts.sagepub.com/social-science/concept/sampling_error> ;
  a skos:Concept ;
  skos:prefLabel "longitudinal research"@en .

<https://concepts.sagepub.com/social-science/concept/law_and_society_research>
  skos:prefLabel "law and society research"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/longitudinal_research> .

<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/longitudinal_research> .

<https://concepts.sagepub.com/social-science/concept/statistics,_research_methods,_and_measurement>
  skos:prefLabel "statistics, research methods, and measurement"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/longitudinal_research> .