Consider the wide variations in traffic measurement figures for two Informa Business Information niche websites: BioTechniques (Biotechniques.com)and BioProcess International (Bioprocessintl.com).
In a recent study, BPA tabulated that Biotechniques.com had 64,969 unique visitors in August. Audience measurement site Compete.com had a significantly smaller figure: 11,810.
Similarly, Bioprocessintl.com had 3,800 unique visitors in August, according to BPA. Compete.com had no figures for Bioprocessintl.com, which implies that the statistical sample was not large enough.
Some of the discrepancy can be attributed to the different methodologies used by BPA and Compete.com. BPA uses a census-based system, where it determines unique visitors by consulting a site's servers. The downside of this approach is that it's difficult to gauge the demographics of visitors. (Additionally, this approach must filter spiders and bots and also account for cookie deletion, which can inflate unique visitor counts).
On the other hand, Compete.com and other online audience measurement companies, such as comScore, use panel-based measurement. By their nature, these panels are composed mainly of consumers and chronically undercount b-to-b traffic, observers say. However, these panels do provide more complete demographic characteristics of audiences.
Surprisingly, even though BPA's census-based figures for b-to-b websites tend to be markedly higher than panel-based measurements, BPA said that many of the websites it audits are likely undercounting their audiences. As a result, these websites may be leaving money on the table.
“If websites contain pages that are untagged, the potential is there for media owners to considerably underreport the amount of traffic to their sites,” Peter Black, BPA's senior VP-business development, said in a statement. “ObservePoint technology allows us to uncover those pages that are not tagged and ensure sites are getting full credit in the eyes of online advertisers and media buyers.”