Welcome to WebmasterWorld Guest from 188.8.131.52
Forum Moderators: werty
For example, say a visitor initially comes to your site via Yahoo PPC, doesn't convert, yet they come back later via Natural Search. Yahoo will track that as a PPC conversion whereas GA will credit Natural Search. This won't explain a *huge* variance but it is one reason why Yahoo tracking should always be higher than GA tracking for Yahoo PPC.