收视率是指在某个时段收看某个电视节目的目标观众人数占总目标人群的比重，而收视率调查是为了充分了解节目的收视情况。
尼尔森的收视率调查是在美国进行的，这或许可以解释与IBM的分歧。
Since Nielsen only measures TV viewing in the U.S., that could explain the differences between their findings and those of the IBM study.
同时，还可以利用此功能开展用户收视率调查，下一步也可以开展双向视频点播服务。
At the same time, still can use this function develop user ratings research, the next step can also develop two-way video on demand service.
美国广播公司的高管称，《迷失》DVD销量、视频点播量和iTunes下载量领先整个行业，这几方面的观众有数百万，尼尔森公司(Nielsen)的收视率调查没有将其计入。
'Lost' is an industry leader in DVD sales, video-on-demand and iTunes downloads, which add several million viewers not included in Nielsen ratings, ABC executives say.
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