Quote:
Originally posted by stocktrader23
google
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ok here's what i found
"How the Data Are Collected
National Measurement
The heart of the Nielsen Media Research national ratings service in the United States is an electronic measurement system called the Nielsen People Meter. These meters are placed in a sample of 5,100 households in the U.S., randomly selected and recruited by Nielsen Media Research. The People Meter is placed on each TV set in the sample household. The meter measures two things - what program or channel is being tuned and who is watching. The People Meter is used to collect audience estimates for broadcast and cable networks, nationally distributed syndicated programs and satellite distributors."