The data is much more accurate now with streaming services. They know every show being watched at all times and how many households are watching it. Absolutely every piece of data about your viewing habits is tracked and sold back to the production companies.
The woman who watched Bee Movie 400 times doesn’t matter because it’s easy to tell that it is the same person, so it still only counts as 1 unique household.
With network television and the old Nielsen rating system, the data isn’t as perfect and its just a statistical approximation, because they aren’t tracking everyone. If one household with a 25-35 year-old person is watching, they simply guess that means some thousands of people of that same age group are also watching.
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