I would like to cover some of the basics, and define some of the common terms that are used when discussing affiliate programs. For those of you new to affiliate programs this guide should help you quickly get up to speed on how affiliate programs can make an excellent, and profitable, addition to your web site. Here are some of the more common affiliate program terms you'll likely run into, and their basic definitions:
Amount earned / (number of impressions/1000)
Calculating the CPM of affiliate programs can be an effective means of comparing the results over time from various programs -- allowing you to put more emphasis on the strong programs, and dropping the poorly performing programs.