I know one way they measure it is similar to what they do for Radio. It is a diary that a select group of people receive and they fill it out for a certain period of time. You are required to fill out in detail every program you watch all the time for every TV in the house.
I was contacted by a marketing group recently and they are sending me a diary. I should get it this week actually. I can finally do my part to get shinguard like the Hilton's off of TV.
I would be surprised if someone else on this board hasn't filled one of these out for either TV or radio at somepoint.
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