As mentioned previously, I'm studying for the BJCP and I have a lot of trouble with the German beers and the statistics. I've not been a huge lager fan (until this course that is) and I can't keep them straight. So graph number 1 today is the IBU over ABV for the styles. The guidelines give a range and I've taken the mid-point, though it is often pointed out that the winning beers are likely to be at the top end of the styles (or beyond). Still, here is graph 1, which includes styles 1d - 4c.
So here we see that in general the high end of the light lager (1d,e), the Pilsner (2), European Amber Lager (3) and Dark Lager (4) varietals all go down in bitterness as the ABV increases, The exception is the American Pilsner, but we over-hop everything compared to Europe. The other is the Dortmunder, which I inlcude here as it is German (ditto the Munich Helles). Still, a tidy way to sort the beers. I also graphed the OG:BU that Ray Daniels talks about in his excellend Designing Great Beers. I've never found that to be too intuitive, but its just a factor change from what I'm doing (as the BJCP almost always figures the FG to be 75% lower than the OG, and ABV is calculated out from that). Still, here it is, again using the OG:BU of the mid-point values.