With any hot topic there's bound to be disagreement and attribution analysis has drawn its share of debate.  These authors, while offering their opinions on much of what has been written on the subject to date, invite your scrutiny of their approach to analyzing attribution over multiple time periods.

Attribution Analysis: Combining Attribution Effects Over Time Made Easy
Leonid Kirievsky, Ph.D., In Tech Pty Ltd. and
Anatoly Kirievsky, University of New South Wales