How Is Comscore Measured

Comscore’s ranking system is an aggregated list of their audience measurement services across platforms like TV, mobile, and online. It is further broken down into five measurements: total unique visitors or viewers, reach, composition index UV, total hours per month, and average time spent per month.

How do they calculate viewers for TV?

Television Ratings FAQ Nielsen uses a technique called statistical sampling to rate the shows. Nielsen creates a “sample audience” and then counts how many in that audience view each program. Nielsen then extrapolates from the sample and estimates the number of viewers in the entire population watching the show.

What is the difference between Nielsen and Comscore?

While Nielsen’s ratings are based primarily on a panel of sample homes, Comscore focuses on the big data from cable boxes and smart TVs.