ONLINE-ADS>> Really basic question about counting 'unique impressions'

PiYeePress_at_aol.com
Tue, 13 May 1997 18:43:14 -0400 (EDT)

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Most of the stuff in this list is over my head. I'm just getting my feet wet
in the advertising thing and I have a question about the counting of 'unique
impressions per time period', which if I'm not mistaken is the standard way
of charging for ads.

The question: If 'uniqeness' is determined by the IP address of the document
requester, how does one take into account dynamic assignment? That is, most
ISPs assign a dialup customer any one of a number of IP addresses each time
they dial up. So hits on a page from several different IP addresses actually
represent the same person requesting the page during an unknown number of
distinct sessions.

Or is there a different way that 'uniqueness' can be determined?

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