Daily Page Impressions
Daily page impressions indicate how many times ads are shown per page. You can use your average, anticipated, or current daily page impressions for this

Click Through Rate (CTR)
This figure represents how many visitors actually click your advertisements. You can find this easily on your Google AdSense stats page labeled "CTR." The average rate is estimated to be about 1.5%.

Cost Per Click (CPC)
Your CPC is the average of how much you get paid for someone clicking one of your advertisements. To find your average CPC take you?re the amount of money you have earned from AdSense (daily, monthly, or all time) and divide it by your total clicks (daily, monthly, or all time).