Un jurnal pastrat de membrii unui consumer panel pentru a inregistra vizionarile, auditiile sau ce anume este masurat. Pentru masurarea audientei TV, cercetarea bazata pe diary a fost predecesoarea peoplemeteres, care sunt utilizate acum( vezi: Peoplemeters).

A log kept by members of a consumer panel to record their viewing, listening, purchase, consumption, or whatever is being measured. For TV audience measurement, diary-based research was the forerunner to peoplemeters, which are now in use in all developed markets and, increasingly, developing markets (see Peoplemeters).

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