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         prudent to consider all
        available measures, so as to triangulate the problem from as many angles
        as possible. One of the measures is commercial audience retention: the
        percentage of the program audience that stays tuned through the average
        commercial on each network. This is of course a reflection of the degree
        to which each network’s audience tends to channel-switch. That in turn
        is a combination of two things: the types of people that generally view
        that network and the likelihood of the programs on that network to hold
        viewers back from switching away once they have switched in. 
        
        The data in the accompanying table
        are some of the first of their kind to reach industry eyes. As digital
        set-tops and other forms of Interactive TV (ITV) roll out, we will be
        seeing more of such data since ITV in all its forms will make practical
        the collection of clickstream data for TV. Whereas Nielsen meters are
        accurate down to half minutes, clickstream data can be accurate down to
        milliseconds, and therefore are more useful for analyses of this type. 
        
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         We
        also observe that the music video channels tend to cluster at the low
        end of this spectrum. This is logical in that their programming can be
        enjoyed in small doses; one does not need to wait very long to see a
        plot resolve, for example. As mentioned, media planners ought to look at
        all measures, not just this one. For example, the high standing of
        Cartoon Network in this measure might well be offset by some other
        measure, such as attention or roomspeculation, while these retention
        data are empirical. The sample size of about 500 homes across a month is
        higher than the average Nielsen meter sample size in local markets and
        each network’s percentage is an average across at least 100 spot
        airing observations. The data show reasonable stability when broken out
        by top advertisers. For detailed data feel free to contact me via
        e-mail.   
         Bill
        Harvey is chairman-CEO of Next Century Media and a regular columnist to The Myers
        Report. He can be reached
        via e-mail at info@nextcenturymedia. corn 
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