Update 2 (July 15, 2014): New, more accurate data is here.
Update (Jul 1, 2014): This post doesn’t measure releases in 2-week totals, which turns out to be a huge deal in many, many cases. I’m currently working on an updated version of both this and the other 2011-2012 manga boost posts. Just be aware of that before citing the data from here regarding any one show.
Some time ago, I published an article looking at how anime adaptations produced in early 2012 affected the sales of their source manga. It was interesting data to take a look at, and it was interesting to see which anime really boosted the manga sales. Long story short, there are cases where a manga really jumps from mid-tier to franchise level (Space Brothers, Kuroko’s Basketball, Inu x Boku SS) soon after the anime airs, and cases where the anime doesn’t have much visible effect.
It was very intriguing to look at, but it wasn’t a sample large enough to draw real definitive conclusions from. So I’ve recently been pulling sales records for manga that had an anime adaptation air in 2011, to get a better idea of how the two media are interrelated. This post contains the first half of that data, specifically the data for which I have specific totals from both before and after the anime first aired, and some observations on that data.