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Comment by radu_floricica | Hacker News Reader

Not if weighting is below 1.0, i.e. threads with lots of comments get less karma, but sparse threads get close to 1.0.

Something like

  karma per vote = #comments / #votes

Okay, actually that sounds reasonable.

Hah wait that's not actually what you said, which still doesn't sound reasonable.

Also a better formula might be something closer to

  karma per vote = thread karma / total comment karma in thread

Oh, and of course the average would have to be weighted by thread karma.

  average = total user karma / sum of thread karma over all threads commented in