Zipf law plot (frequency as function of frequency rank) for various texts.

The languages, texts and the word frequency files are:

[[English language|English]]. Text of [[H. G. Wells]]'s novel ''[[The War of the Worlds]]'' (1898), excluding numbers, mapped to lowercase.

* Whole text. Sample: ''<nowiki>no one would have believed in the last years of the nineteenth century</nowiki>'' [...] ''<nowiki>there were already a couple of score of passengers aboard some of</nowiki>''. File engl/wow/tot.1/gud.wfr (original 60293 words, truncated/filtered to 35027 words, ''N'' = 4869 distinct).

[[English language|English]], encrypted by replacing each distinct word with a Roman numeral, in order of decreasing frequency: like 'that' ⟶ 'xiii', 'his' ⟶ 'lxiv'. The letter 'p' is used for 5000. Text of [[H. G. Wells]]'s novel ''[[The War of the Worlds]]'' (1898), mapped to lowercase, excluding numbers.

* Whole text. Sample: ''<nowiki>ccv lii clxix cxxix mdcxxvi xxiv xx dccxii mcmxlix i xx mmmdccclxxxiii</nowiki>'' [...] ''<nowiki>mdccclxiii mmmciv cccxxii i</nowiki>''. File enrc/wow/tot.1/gud.wfr (original 60293 words, truncated/filtered to 35027 words, ''N'' = 4869 distinct).

[[English language|English]], encrypted with a [[Vigenère cypher]] with a 27-character alphabet (letters plus apostrophe), preserving spaces, with key 'ferrocyanide': like 'no one would have believed ...' ⟶ 'ss eds yluyl ke'i svzkbvrl ...'. Text of [[H. G. Wells]]'s novel ''[[The War of the Worlds]]'' (1898), excluding numbers, mapped to lowercase.

* Whole text. Sample: ''<nowiki>ss eds yluyl ke'i svzkbvrl lr ylv bouq yriuw tj jys pfnrahisxy tspqudf</nowiki>'' [...] ''<nowiki>tumui aihv onoenla e hskfzg lf ekrvj sw foupe'ohvx eseota sauh sk</nowiki>''. File envg/wow/tot.1/gud.wfr (original 60293 words, truncated/filtered to 35027 words, ''N'' = 12911 distinct).

The word frequency files '*/*/*/gud.wfr' are available at the [https://www.ic.unicamp.br/~stolfi/EXPORT/projects/voynich/Notes/tr-stats/dat/ UNICAMP website].  The original annotated full texts, before truncation/filtering, are in the companion files */*/org/main.src.  The truncated/filtered texts -- one word per line, without punctuation -- are in */*/*/gud.tlw.