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Clearly the impact on AdSense publishers will differ depending upon the subject matter of a site and its relationship to changes in the economy. Many will likely not feel it at all, but I suspect some are really going to be hurt until the economy turns around.
Those impacted may be able to reduce the effect by massaging the use of AdSense on their sites or by adding or adjusting revenue streams.
In my case, I notice a significant decline in EPC on my main site - in a niche which has definitely been negatively impacted by the economy. Several large and long-term advertisers seem to have totally disappeared in this niche.
I have made several adjustments already and am actively considering others.
For instance taking overall earnings since Feb 1st and using my daily average as 100% I see that my lowest day has been -35% and my highest +32%.
What is significant is that of the past 76 days is that:
Only 11 days were -20% or more
Only 13 days were +20% or more
Meaning 68.41% of days were all within the +/-20% daily average.
Simplistically what does this man to me when checking metrics?
Every month to expect +/-5 days -20% daily average.
Every month to expect +/-5 days +20% daily average.
Although my overall earnings are not as high as a couple of years ago these averages have proven quite consistent except at times of "Glitches"!
Try checking your metrics this way however YMMV! :-)
HuskyPup, You've discovered that your total daily earnings are normally distributed with a standard deviation of about 20%. :-)
Hehehe...yup, and knowing this it is why I can suddenly see when something's wrong/changed/fubar/whatever!
Actually, it would be interesting to know if this is a "standard" deviation, low or high...what do you reckon?