A "review" on fanfiction.net is a comment. Many readers who leave comments, leave one on many chapters or even every chapter. A reader saying "MOAR PLZ" on chapter 1 and "OMG LOL" on chapter 2 counts as 2 reviews.

Um... I am well aware of that, and already dealt with that in my analysis. So, any response to any of my other points?

EDIT: when you edit a comment which has been replied to to substantially address that reply, please don't do that.

Oh, I see you know that. I'm interested in your data on average # of reviews per user. 2.7 seems low. I checked this number by downloading all the comments on HPMOR today for chapters 1-4 by hand, extracting the usernames into one username per line, and comparing line count of that file to line count of sort -u <that file>. The result is that, in chapters 1-4, the average user left 1.48 comments. It therefore seems unlikely to me that it could be 2.7 over the entire story.

It may seem low; nevertheless, when I downloaded all of MoR up to ch82 or whatever it was up to when I did that analysis, that was the average count. You can reuse my provided scripts if you doubt it. I don't find it too hard to believe: there's high reviewer mortality, and I noted that people tended to leave reviews on either the first chapter or last chapter and avoid middle chapters, so ch1-4 would not be a representative random sample.

EDITEDIT:

But these distributions are non-intuitive. Extending this to chapters 1-8 I get no increase in average comments per user; it changes to an average of 1.45.

Yep, like I said. Reviews are very non-uniformly distributed; besides the start/end effect for completed fics, there's also the accumulation of reviews on the latest chapter, where chapters posted right before long hiatuses accumulate more reviews than chapters which are part of regular update periods.