How does Black Box define a comp unit? Monique Dilonga Updated July 22, 2019 18:58 Follow A comp unit is defined as a unit with 78 weeks of data behind it. Related articles What are BBI Daypart Definitions? How do you track traffic? 2020 Reporting Schedule Can I benchmark my performance against other industry segments besides my own? What is a DMA? Comments 0 comments Article is closed for comments.