5 ms·
I believe there is under "A Better Metric" dx is the number of days the user is registered. If the user made one post and then stopped, his karma score would
by eric-hu 15y ago
I believe there is under "A Better Metric"
dx is the number of days the user is registered. If the user made one post and then stopped, his karma score would shrink over time as dx approaches infinity while the numerator remains constant.
The numerator technically has an extra term for each successive day, but it looks like that additional term is 0 if no comments were made on that day.
- gjm11 15y agoIt's worse. The additional term is undefined (it's 0/0-1) for days with no comments.
- eric-hu 15y agoI figured that was just a special case they didn't explain directly. The equation follows their description if you treat the 0-comment days as a 0 for the term in the parenthesis: people who post infrequently will see a shrinking karma.