The rating system assigns a law to each player. ... The greater the standard deviation of a player's law, the less certain the rating system is of the player's playing strength. The probability that a player's playing strength is within one standard deviation of the mean of the player's law is approximately 68%.

How are ratings calculated?

Rating: Ratings are essentially percentages, measuring the portion of a given group — be it households, adults 18-49 or women 25-54 — watching a given show. ... So a 2.0 rating for The Masked Singer means that 2 percent of people in that age range, roughly 2.56 million people, watched the show.

How do TV stations know how many viewers are watching?

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.