@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_study> .

<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_study> .

<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_study> .

<https://concepts.sagepub.com/social-science/concept/census_research>
  skos:prefLabel "census research"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/longitudinal_study> .

<https://concepts.sagepub.com/social-science/concept/documentary_analysis>
  skos:prefLabel "documentary analysis"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/longitudinal_study> .

<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_study> .

<https://concepts.sagepub.com/social-science/concept/pharmaceuticals_and_clinical_trials>
  skos:prefLabel "pharmaceuticals and clinical trials"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/longitudinal_study> .

<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_study> .

<https://concepts.sagepub.com/social-science/concept/quantitative_data_analysis>
  skos:prefLabel "quantitative data analysis"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/longitudinal_study> .

<https://concepts.sagepub.com/social-science/concept/longitudinal_study>
  skos:narrower <https://concepts.sagepub.com/social-science/concept/retrospective_data>, <https://concepts.sagepub.com/social-science/concept/attrition>, <https://concepts.sagepub.com/social-science/concept/census_research>, <https://concepts.sagepub.com/social-science/concept/documentary_analysis>, <https://concepts.sagepub.com/social-science/concept/prospective_data>, <https://concepts.sagepub.com/social-science/concept/sampling_error> ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/pharmaceuticals_and_clinical_trials>, <https://concepts.sagepub.com/social-science/concept/quantitative_data_analysis>, <https://concepts.sagepub.com/social-science/concept/research_design> ;
  a skos:Concept ;
  skos:prefLabel "longitudinal study"@en ;
  skos:definition "Longitudinal studies follow the same subjects or a population over time. Because the same population is followed over time, changes collected from different observations can be attributed to individual changes rather than different samples of subjects. [Source: <a href=\"https://sk.sagepub.com/reference/healthcaremanagement/n458.xml\" target=\"_blank\" data-id=\"to-sk\">Encyclopedia of Health Care Management; Longitudinal Study</a>]"@en .

<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_study> .