The Past Purchase tab shows the most popular products and categories over the selected time period (the default is the past two years), as well as the contacts who purchased them.
Unlike the Predictive Affinity charts, these are based on real data, and should be used as an indication of trends or of the success of promotional campaigns.
Please also note that this charts shows contacts, not items. Therefore, if a contact purchases an item in the same category twice, they will still only appear once in the charts.
For more information on how to create a segment using this report or how to update the chart, see Smart Insight Attributes.