Demo关键群分别有三个是18-34、18-49、25-54，其中用来当标准的是 18-49，一般讨论demo收视率都是指18-49这段年龄层，也是各大电视台 最重视的部分，因为这决定了绝大多数的广告金收入。 另外，有些电视台会「额外」看更细分的demo收视率，比方CW电视台就 很看重18-34岁的女性观众这块饼。 = = = 以下引一段文章，作为demo收视率为何如此重要的例子。 http://en.wikipedia.org/wiki/Nielsen_ratings： Demographics Nielsen Media Research also provides statistics on specific demographics as advertising rates are influenced by such factors as age, gender, race, economic class, and area. Younger viewers are considered more attractive for many products, whereas in some cases older and wealthier audiences are desired, or female audiences are desired over males. In general, the number of viewers within the 18-49 age range is more important than the total number of viewers.[4] According to Advertising Age, during the 2007-08 season, Grey's Anatomy was able to charge $419,000 per commercial, compared to only $248,000 for a commercial during CSI, despite CSI having almost five million more viewers on average.[5] Due to its strength in young demos, Friends was able to charge almost three times as much for a commercial as Murder, She Wrote, even though the two series had similar total viewer numbers during the seasons they were on the air together.[4] 拿2007-2008季度的GA和CSI相比，尽管CSI平均收视人数大於GA的收视人数， 但GA的demo收视率的出色表现，让节目每集广告金达到$419,000（每30秒的 广告收入），而CSI则是$248,000（受到同时段GA的打压而被压低）。 後面还举了六人行和Murder, She Wrote的例子，六人行刚好与MSW後两季一 起播出，虽然收视人数接近，但六人行广告收入却是MSW的三倍。 = = = 顺带一提，因为无比强大的demo收视率，FOX的AI霸占最赚钱电视节目榜首好 几年。XDDD （根据板友建议作修正　2009/10/08） --

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