I have clients for which I do online advertising. I place ads on publication websites and in e-newsletters. When I provide ad materials to the publication, I always use the Google URL Builder so I can track campaign activity.
The problem is this: More often than not, the stats the publication provides (usually simple click-throughs) are waaaaay higher than the GA campaign metrics. In the most recent case, the publication's stats were 300% higher.
Has anyone else run into this? What other factors may contribute to the two sets of data being so far apart (other than the publication inflating the numbers)?