That article was nuts. Hard to believe that crunching all that data and making all those cute charts would be helpful to someone who is trying to learn crack/gear sizes, but I guess we're all wired different.
This excellent article was posted by PellucidWombat over at SummitPost. summitpost.org/size-matters-a-... A lot of climbers seem to scoff at this type of quantitative analysis and prefer to go on the subjective "feel" of gear, but I really enjoyed this writeup.
edit: works fine now, weird. That dude had a LOT of time on his hands!