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Date: 2015-03-16 09:27:58Validity Scientific method Clinical research Epidemiology Randomized controlled trial Evaluation methods External validity Internal validity American Economic Journal Statistics Design of experiments Science | PetersLangbeinRoberts_External Validity_20150313_draftAdd to Reading ListSource URL: www.hhs.seDownload Document from Source WebsiteFile Size: 219,79 KBShare Document on Facebook |