Web Intelligence offers functionality to track data changes by comparing the results of the latest refresh to a previous reference point. This can aid data analysis by focusing on changes rather than on all of the data within the document.
You select a particular refresh and set it as the ‘baseline’ (i.e. reference). After a refresh, the current data is placed in context by showing how it relates to the reference data. Data tracking can make the current data more meaningful by placing it in context with old data.