I’m a college professor working on a script to grade student’s contributions to discussions. I see that avg_time is the logarithmic mean of post_timings.msec. When I look at data in post_timings.msec, I see that sometimes read times are on the order of 15 minutes. I guess that means that someone opened the page and went and did something else for a while? And I guess this is why we take the geometric mean.
I also wonder what effect it might have to publish post scores would be. If anyone’s interested, here’s how they are calculated.