|Site-Centric Measurement||Ad-Centric Measurement|
|1.||Site centric measurements are site based and the counts are derived from a web property’s||Ad centric is based on Ad server’s logging processes|
|2.||Site-Centric measurement represents basic metrics like page-views, unique browsers, or time spent.||Ad-centric represents metrics like click-through, ad specific activities are included|
|3.||The data is always collected by the website owner||The data is collected by the ad server owner|
|4.||Audience measurement derived from web server and page tag logs.||Audience measurement derived from a 3rd party ad server’s own server logs|
*NOTE : Together these are considered as CENSUS BASED measurements
Another measurement includes are:
User-Centric and Network-Centric measurement.
In User-Centric the audience measurement is based on the activity of a sample of Internet users i.e. activity of people versus browsers. These sample of users are the ones who are willing to have their usage data collected.
In network-centric measurement a research provider collects the data from one or more ISPs.