A Comparison Report allows you to view your summarized data broken down by a subgroup of the data. This grouping can be set up based on Campaign, Publisher, Advertiser, Device, Goal, Landing Page, Source, Operating System, month, Country, City, Region, Carrier/ISP, Browser.
Comparison Reports are used to examine trends in your data for Clicks, Conversions, Payout, Revenue, Profit, Impressions, CR, EPC, CTR, Sale Amount etc.
To access Comparison Report go to Report and click on Comparison report from the left menu.
To use a Comparison Report, Select the Compare From Date Range and Compare with Date Range values.
Note the growth is shown in green color while the decline is shown in Red color.