After playing a couple of games yesterday, my abandon rate went from 0% to 1%. Yet I didn't abandon/rage/disconnect any game. And haven't done so in any of my games.
I did have a game that aborted because someone else failed to load before getting to hero selection. But I've had that happen before and never received an abandon. And I know I was loaded because I was chatting with others while waiting for loaders.
Best Answer
You recieve an abandon if :
You used to recieve a "secondary abandonment" if one of the member in your party abandoned the game (following one of the condition listed above). Those were displayed between bracket in your DotA profile :
But since one of the last patch they are no longer counted and you just have a global % of game abandonned in your profile.