Reduction in CPC revenue

CPC reduction adsense

[jonnyr9]

My mean daily CPC rates had been falling in a good range for 25 days, then dropped suddenly on Friday (29.08.03) last week, and have been underperforming (less than 1/4 of the previous average daily CPC) since then.

Has anyone else seen this?

Does anyone else know how to deal with this? Should I exclude sites which I think have a high CTR but low CPC?

Wish we could get a little more stats (which pages clicks are originating in) and control minimum CPC

[zoltan]

Thursday was my best day in terms of revenue. On Friday the revenue was only 45-50% of the Thursday revenue.

[jonnyr9]

Having started this thread, I feel I should give a current analysis of the CPC situation in my market.

I analyse my CPC figures in Excel, plotting mean CPC over the last 4 days (for each day) versus time, within error bars showing Standard Error (StDev / SQRT n) where n=4 because I'm measuring over 4 days.

Instead of applying stats, I use the rule of thumb that if the error bars don't cross-over, the change is real. Using this method I concluded that my market saw a 3 week blip of heightened CPC. I can observe peaks and troughs which are lengthening, there currently appear to be 24 days between peak and peak for the last two cycles. I have experienced a maximum 2.5-fold difference in CPC between peak and trough. I am sure these things are website and market specific.

I am confident of this cycling because I see an increase in CPC for 6 of the last 7 days. Its like watching the stockmarket.

[killroy]

Well, I'm running two seperate groups of websites, each with a distinct different market, one focused and expensive, the other broad and cheaper.

One is more business oriented, and one is more consumer oriented. One does >70% of all income duing my night hours when the US is awake, The other does >70% in my day hours when europe is up and about. One makes its peak income on wednesday, and hold up pretty well on the weekend, and the other peaks on monday, and then going steeply down to a low at about half the same income for sunday.

This has been repeated week after week, and all real fluctuations have been due t ads getting de-PSAed, impressions going up due to more pages spidered, and my tweaking pages to get better targeted ads (like using H1s properly).

You have to watch stats for at least 4 weeks to be able to see trends, but by then you'Re seeing monthly or seasonal trends...better watch for 4 years :)

Conclusion: None of my observations support the theory of diminishing AdSesne Income.

SN