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Ldandy said:What you are describing is keeping a "Nielsen Diary." These booklets are/were mass produced and distributed in select markets for use as an additional data point for local affiliates to set ad rates during sweeps periods. There are however device thingamajigges that are attached to TV's to meter usage. These "people meters", as they're called, are responsible for generating The Nielsen Ratings that everyone likes to reference. One single home's viewership will be considered representative of tens of thousands of homes featuring the same demographics within that area. If anybody here has these devices installed in their home, I suggest watching LOTS of UConn Programming. Things may have changed a bit technology wise over the last few years, but this is how it was done when I worked for NMR in Eastern PA, Southern NJ, and Upstate NY for many years in the 2000's.
There are diary markets and meter markets. Same with radio.