[Article] Topic Modeling in the Voynich Manuscript

[Mark Knowles]

BTW, also the fact that word structure is fairly consistent across sections while word frequencies vary so much is very puzzling.

Assuming that the ms was created with the use of external aids like tables, wheels, lists, external text, or something else, this could be explained by some portion of these aids or their content having been changed or replaced at points during the creation for various reasons. Has there been much discussion that different sections could have been enciphered differently? 

If they used modified cipher keys similar to the kind used in Italian diplomacy, at that time, then those kind of changes would be quite normal. I don't know how much this has been discussed, but I have certainly mentioned it before either on Ninja or Nick Pelling's blog.