@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix nalt: <https://lod.nal.usda.gov/nalt/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix dc: <http://purl.org/dc/terms/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<https://lod.nal.usda.gov/naltv#Definition>
  a owl:Class ;
  rdfs:label "Concept definition"@en .

nalt:341427_def
  a <https://lod.nal.usda.gov/naltv#Definition> ;
  rdf:value "An ecological study is an observational study in which data is analysed at the population or group level rather than at an individual level. These studies are often conducted to measure risk factors, prevalence and incidence of a disease at a population level."@en, "Estudios observacionales en los que los datos se analizan en el ámbito poblacional o grupal, en lugar de hacerlo en el plano individual. Se suelen llevar a cabo para medir factores de riesgo, la prevalencia y la incidencia de una enfermedad en una población."@es ;
  dc:source "NAL Thesaurus Staff" .

nalt:341427 skos:definition nalt:341427_def .