(For example, karma for posts and comments is merged together — but quick Google appears to show karma points for posts are calculated as the number of upvotes a given user's content has received minus the number of downvotes; since HN hides downvotes, appears it’s impossible to separate karma from submissions and comments.)
Am I missing something?
EDIT: Title to include “for other users” since it appears per comments below it’s possible to get average karma per comment for yourself per this formula:
https://news.ycombinator.com/item?id=35069761
Different topics evoke different engagement from members be it either positive, negative or both.