If you're saying there are more of them and that Nielsen relies on a sample, then that's probably right. (Although, statistically, I'm not sure that matters).
And Google doesn't use analytics from set-top boxes, they use data from Nielsen:
"The demographic data imported for Google TV Ads comes from The Nielsen Company, the longtime television audience measurement experts. AdWords data is drawn from their National Homevideo Index (NHI) daily national cable report. We draw the demographics from the viewing source data, using the quarter-hour report periods."
If you're saying there are more of them and that Nielsen relies on a sample, then that's probably right. (Although, statistically, I'm not sure that matters).
And Google doesn't use analytics from set-top boxes, they use data from Nielsen:
"The demographic data imported for Google TV Ads comes from The Nielsen Company, the longtime television audience measurement experts. AdWords data is drawn from their National Homevideo Index (NHI) daily national cable report. We draw the demographics from the viewing source data, using the quarter-hour report periods."
http://adwords.google.com/support/aw/bin/answer.py?hl=en&...