A campaign often transcends channels and vendors and straddles different time periods with leading/lagging indicators that interact in a complex way with each other. Good campaign analysis requires differentiations between regular lift vs. campaign-specific lift at the basic minimum. An effort should also be made to cleanse data of leakages from other campaigns for accurate reporting. But this task is not easy and cannot be accomplished by most analytics solutions in the market.
Convertro, on the other hand, tracks all touchpoints both offline and online and can help: