alephh - 12:54 pm on Feb 6, 2010 (gmt 0)
Marcito: Good to know others are having some problems too.
Sid786: Fluctuations are more random, this is like a penalty: a sudden sharp consistent change. After enough years and enough data most fluctuations/changes are logical and can be learned/identified (seasonal, freshness/site-structure-change -effect, penalties, bidding, algo updates, trust, flush of new ads, etc). And having enough traffic+clicks means the daily averages vary very little normally.