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Magid Abraham fired back after Google's quarterly financial report seemed to refute comScore's claims that paid clicks declined for the search advertising giant.

The apples to oranges comparison of Google's global revenue to the US paid click data assembled by comScore left people missing a key issue, Abraham argued in a statement from his firm.

"Following several historical quarters of strong sequential domestic revenue growth (including the seasonally equivalent Q1 2007), Google’s Q1 2008 revenue growth was essentially flat, which represented a significant change for Google’s domestic business," said Abraham.

Revenues in the US for Google have followed the paid search clicks tracked by comScore. As shown in this graph at comScore, a strong correlation between paid clicks and search revenue goes back to Q4 2006.

The correlation comes with a slew of caveats. "The comScore data do not include the impact of changes in Google’s price per click and do not include paid clicks from partner sites like AOL, Ask, Washington Post, etc. nor paid clicks from the AdSense network," Abraham said. "But the strong relationship of the two trends is undeniable."

Since Google has enjoyed strong international business, and they continue to focus on a Chinese Internet market that now reportedly has more users than the US, it's likely the Google executive offices don't contain a lot of worried people.