50% down, then a week later 100% up

I'm getting dizzy

[sailorjwd]

Last sunday EPC/CPM dropped 50% from fairly steady levels whole month of Dec. Values stayed at that level for the week.

Now, this sunday (10 hours in), EPC/CPM up 100%.

Pages that were getting single-digit cpms now have double digit values. CTR up nicely contributing to CPM rise.

It is nice to know that G has the ability to show decent ads with more reasonable EPCs on my pages.

Why did this happen today? Do my pages suk less today?
Did a bunch of advertisers get drunk last night and up their bids?

Anyone else seeing an odd rise in stats?

[iwannano1]

Ups and down are common with Google search and Adsense. I had same problem in Nov-06.

[kevindy]

My PV are twice of last month,but I just earn 1/3 of last month.I don't know what happen.

[europeforvisitors]

What's your sample size, roughly speaking?

I've got a sample size in the tens of thousands, and it isn't uncommon for eCPM to vary by 25 or 30 percent from day to day within a given month.

[sailorjwd]

My sample size is 10% of what I would like it to be.

EFV, I've been doing adsense for 3 year now.

For two years I've seen gradual decrease in overall earnings on a steady basis.

The 50% cut starting last sunday was absolutely out of the ordinary. Todays values are back to recent month normality.

60% of the increase today is due to better targeting resulting in better CTR and the rest is simply higher EPC on pages that had lower EPC.

[drall]

sailorjwd, we have a fairly large network of established sites and have been with adsense since the start and have seen a massive amount of volatile earnings compared to 3.5 year moving trends.

This all started last month and continues into Jan. for us. We have millions of visits a month on these sites so it is a very large sample size. One day we see record highs followed by 2 days of record lows with no reason and no changes in traffic levels or sources. You are not alone.

[danimal]

congrats sailor on the rise in income, lets hope that it averages out to be higher than what you were getting.