I dunno guys, I think you need a truly mindboggling amount of statistics (and a lot of skilled chimps to browse through it all) to really be able to conclude anything from such ref-stats.
Not saying Italian refs can't be corrupt. Hell, "corrupt" is their middle name, but it's just so complicated really. I mean, ok, Inter hasn't got a penalty against them this season you say. Out of how many disputable situations? And how do those stats relate to other clubs? Etc etc.