We're talking about the ideal chapter length. Yes, chapter length is easy to quantify. But what about chapter idealness? If we want to discover the ideal chapte

We're talking about the ideal chapter length. Yes, chapter length is easy to quantify. But what about chapter idealness? If we want to discover the ideal chapter length using statistics, we need a way to quantify how effective (or "ideal") a chapter is, and we need ways to control for all the variables that might skew the ideal chapter length (genre, style, etc). Of course, these ways don't exist. "What is an effective chapter" isn't even a question with a single answer—it depends on the author's goals (to inform, to entertain, to provoke a very specific feeling, etc). So anyone who tried to pull out a "chapter idealness in relation to word count" graph in an academic context would be laughed out of the room, and justifiably so.