I was trying to better nail down my drop in income so I was looking through my Google analytics. Very strange thing I came across. My anaytics data is accurate for one of my domains, but for my main domain on the account, the analytics data is showing all of the adsense page impressions (within 2%) but is only showing about about 20% of the clicks (and revenue). Is this data known to be off for some people? It does show clicks on all the different pages, just at waaaaay lower than what adsense performance reports show.