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NONE: Re: ONLINE-ADS>> Gatech survey is self-selected, not a real survey
Re: ONLINE-ADS>> Gatech survey is self-selected, not a real survey
Kathy E. Gill (kegill_at_halcyon.com)
Wed, 18 Feb 1998 20:50:54 -0800
Glenn Fleishman <glenn_at_popco.com> wrote:
>There is virtually no point in quoting the GVU study as a method of
>identifying any trends, patterns, or even numbers on the Web or Internet.
>It has pretty much zero statistical validity because of the self-selected
>and directed nature.
Yes, the respondants are self-selected and please note that the GVU people
make this point on their web site (at least they used to).
That said -- many of their data points (gender breakdown, HH$, etc.) have
been "validated" by other surveys, more rigorous (and allegedly
statistically valid represetations of the US population). So it's not all
"balony" to be dismissed because it shows possible trends, not "hard"
statistics (whatever they are, since most newspaper-type surveys don't even
report their standard deviation but report as news "changes" of only a
couple % points -- probably not statistically significant differences but
hey, it's news).
Kathy Gill
(with her own hot button on stats)
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