Ever wonder how accurate the numbers in Google Webmaster Tools are?
A Google Webmaster Help thread makes you think it is about 90% accurate. Well, let me explain better.
Someone asked why has the impression count not changed from 24,900,000 in three months. Google responded that it means the impressions have not changed more than 10% over that time.
The webmaster asked:
Google’s Asaph Zemach replied:
Pretty neat information, don’t you think?
Forum discussion at Google Webmaster Help.