I have to admit - I'm confused about PubSub's stats. A while back, I had a suspicion that historical values were not stable. In other words, it seemed to me that the values for a few days in the past were not the same when I looked at them a few days ago. Compare these two graphs below. The first I saved on the 28th of September, the second is from today, the 5th of October.
The first has my percentile between (approx) the 8th of September and the 26th of September clearly decreasing. The second has my percentile between (approx) the 9th of September and the 4th of October clearly increasing. The linkRank graph appears to match, but the percentile graph has changed retroactively in some way.
Is this a bug, or is this something I'm not getting about the measurement? If it is something that I'm not getting about the measurement, I think it is still a bug - a bug in data visualization design.