It's limited by time and other factors. If you haven't commented on anything for a considerable time then there aren't enough values to average.
I think it works like this: Take the last N values from the last T time, discard the largest (and perhaps the smallest) and compute the average of what's left. If there aren't enough, don't bother.
For more details, read the code. It's available here somewhere ...
I think it works like this: Take the last N values from the last T time, discard the largest (and perhaps the smallest) and compute the average of what's left. If there aren't enough, don't bother.
For more details, read the code. It's available here somewhere ...