Collection Genre Distribution Statistics

[Geode]

I am wondering about the evaluation of genres provided in statistics. Here is a breakdown of my collection. At 1.7% of the total I do not consider Westerns to be too strongly represented. Yeah, everybody needs a stack of erotic movies, so I really fell down there. I am said to be underrepresented in "Foreign" flicks but only 91 are tallied. I have several box sets with many movies in them and so I actually have 144 individual titles. I am not a huge anime fan, but apparently I need a lot more to be "normal" according to this site. Who actually determined what a normal collection should consist of...?