Assertion: ana | /r/CapableOf | field numerous studies
Facets:
value: from the crossley rating system
type: OTHER
Source sentences:
text: The ANA has fielded numerous studies and helped develop advertising measurement systems from its inception to the present: from the Crossley rating system, developed in 1930, which established national standards by which radio audiences could be measured, to the recently introduced Ad-ID, a system that assigns a unique and permanent code to each ad with 360-degree application.