http://www.reddit.com/r/DotA2/comments/14hy72/math/
this was an interesting article i found on reddit about some mathematical stuff from dota

thought id share it here

I was really intrigued especially when he went into minus armor affecting dps in terms of %'s

Other highlights:
CM's freezing field
DPS increases because of attack speed


Basically he is showing us how much more efficient certain builds can be on heroes if you want to get more dps.

Is minus armor, attack speed, crit, or just raw damage more effective ?