How many people are watching the Olympics? NBC is attempting a tricky head count

Each day of the Winter Olympics, NBC reports how many viewers watched the previous night's coverage, and analysts and television executives attempt to divine what those numbers mean.

But NBC isn't touting traditional Nielsen ratings, the television standard for decades. Instead, for prime-time viewing, the network primarily cites a recently created standard of its own making called total audience delivery, or TAD. It takes the ratings from the broadcast channel NBC and cable channels like

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