Forum Moderators: martinibuster
Scott
1. True CTR (clicks / impressions excluding PSAs/AAs)
2. EPC
3. PSA/AA rate ( ( # of PSA + # of AA impressions ) / AdSense Reported Impressions)
You can get #2 from the AdSense reports. To get #3 you can get the denominator from the AdSense reports, but to get the numerator you have to have had alternate ads implemented (and no PSAs) and track the # of associated impressions. Once you have #3 you can calculate #1. Once you have these 3 metrics you'll have a good picture of what's happening so you can investigate why and do what you can to improve what you can control.
At the very least you need to be looking at the clickthrough rate and the earnings per click separately. And if the clickthrough rate is the problem, putting in an alternate ad so that the percentage of PSA's being shown can be determined is also important.
Just wanting to know why this is happening without needing to dust off my high school algebra skills.
Maybe this is just a cicular thing.
BUT, have you tried blocking some of your ads to see if your visitors are just getting sick of the "same old same old"
Sometimes alot of the ads can be redundant and blocking them may help raise your CTR. It can drop your EPC in some respects but improve your CTR and overall earnings if done wisely.
Those publishers who have a very low consistent PSA/AA percentage (or think they do) might not want to bother, but for publishers like me it's critical. My PSA/AA % jumped to an average of 65% for over a week due to trigger words [webmasterworld.com] (thread about my experience). Looking at my Google reports it looked like CTR and CPM fell through the floor, but the true CTR and true CPM were actually normal. And most of the expected revenue I lost was made up for by affiliate revenue through my AAs, but I'll save that for another thread.
If sschlee wants to begin to understand why his/her revenue is down he/she needs to put together some stats, then analyze what they mean.