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The Yin and Yang Of Online Metrics

Audience measurement and Web analytics systems are like the yin and yang of online metrics. Yin and yang are different, opposing forces, but they also complement each other. Think of Web analytics and audience measurement data in the same way: different, sometimes in opposition, but complementary.

The major difference between these systems is data collection:

  • Audience measurement companies don't collect data directly from the sites being measured. They all rely on proprietary methods. Hitwise gets data from ISPs. Compete uses a toolbar that you can download as well as ISP and panel information. Nielsen and comScore use data collected from panels to create online metrics that they believe accurately represent overall Internet usage. Due to all these different data collection methods and no shared standards across companies, metrics from audience measurement firms are never identical with each other.

  • In Web analytics, data is collected directly from actual site activity. Methods include client-side data collection via javascript page tagging, server-side data collection via log file processing, or network data collection via packet sniffing. Sometimes methods such as page tagging and log file processing are combined in what's called "hybrid data collection." Vendors include Coremetrics, Webtrends, Unica, Visual Sciences, Omniture, Google, and others. The challenge with Web analytics tools is that each tool will calculate different numbers from the same source for identical metrics. In other words, Omniture numbers won't match Google's. That's because each tool has its own "secret sauce" for "sessionization" -- the fancy term for the way metrics are counted and measured by analytics technology. For example, certain tools may be configured to include or exclude certain filetypes or server responses. Robotic traffic may or may not be filtered.

    It's worth noting that a company named Quantcast uses panel data and also enables a site to add page tags to collect actual site data, which are then merged together in a completely different type of "hybrid" model.

    All these different approaches to data collection lead to opposition when these systems are used for the same purpose. For example, conflict arises between the yin and yang when identifying reach using unique visitor metrics. Audience measurement firms may cry "cookie deletion" when analytics tools are used to count unique visitors, and Web analytics firms may shout back "coverage error" and "selection bias" at the unique visitor numbers from panel-based firms. Another area of opposition is demographics. I've been told that only audience measurement firms provide demographic data, and that you can't get demographic data from Web analytics systems. That's not true at all.

    All enterprise-level Web analytics systems provide demographic location information at the country, city, state, and MSA levels. This information will be different than that provided by audience measurement companies.

    Demographics that are harder to elicit from a Web analytics system, but are easily provided by audience measurement, include attributes like a visitor's age, gender, occupation, income, and education.

    But it is possible to integrate very detailed demographic attributes per visitor into a Web analytics system! Once demographic information is captured in a registration database, it can be joined with behavioral data in the Web analytics system and reported on. For a real-world example of analytics/demographic integration, take a look at what Microsoft is doing with Gatineau, the company's free Web analytics offering currently in beta. Microsoft is joining Web site behavioral data with rich demographic data from MS Live profiles.

    Even with differences and oppositions between these online metrics systems, companies find ways to use the data in complementary ways:

  • Audience measurement data is useful for competitive intelligence. All the paid and free services provide data for comparing the performance of a site to other sites, for understanding audience behavior across one or more sites by demographics, and for understanding generalized Internet traffic trends and search terms.

  • Web analytics data is useful for understanding site effectiveness, for defining key performance indicators, for determining conversion rates for marketing campaigns by channel (such as search, email, rss), for understanding what sites and keywords are driving traffic to your site, and for segmenting and reporting online metrics.

    You can even use both data sources as part of the same site optimization activity. For example, you could use audience measurement data to determine that a competitor is gaining ground on a particular product or search term. Then you could look at your Web analytics tool to see how you're doing for the same term and how visitors who searched for that keyword behave on your site. You may find a high bounce rate and low conversion rate for the keyword, so you segment that data perhaps by demographics! Next you suggest a hypothesis to minimize bounce and maximize conversion for each segment. Then you test your hypothesis, and reexamine the data. Based on the results, you then continuously improve your online performance through controlled experimentation. At the end of the day, you will drive more online revenue by understanding how the yin of audience measurement and the yang of Web analytics complement each other, than by worrying about how they differ and oppose.

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