Barb Explained – How we collect viewing data 2 – Device and TV set viewing by time of day Published 14 December 2018 at 1904 × 991 in Barb Explained: How we collect device-based census data Source: Barb, January – September 2018 Note: TV set viewing is plotted on a separate axis to device (smartphone, PC and tablet) viewing. Data are for identified viewing to BARB-reported channels on TV sets / tagged BVOD services on devices. Device data are census data.