Base Difficulty

Base difficulty: Level 470 edit

Level distribution for verb (development): 30: 1 165: 2 170: 1 179: 1 196: 1 249: 1 278: 1 299: 2 300: 1 329: 1 470: 7 475: 1 1399: 6

Per-Language Difficulty Overrides

No difficulty overrides set. The base difficulty level will be used for all languages.

Add Difficulty Override
-1 to exclude, 1-1399 for level
Frequency and Tier Signals
Combined Frequency Rank: 1060 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600

Rank used = synthetic rank this tier contributes to the combined frequency rank (lower = more common).

Corpus Frequency
Corpus Freq (per M) Best form Share Zipf rank Forms
19th_books 18.86 2334 50% 4668 downrated 1
20th_books 22.19 2476 50% 3278 downrated 2
wiki_math 80.84 842 50% 1684 downrated 1
wiki_geography 98.85 1699 50% 1395 3
wiki_biology 67.29 1476 50% 2036 downrated 2
wiki_modern_life 230.36 468 50% 564 downrated 3
wiki_arts 178.40 566 50% 722 downrated 3
wiki_society 501.28 211 50% 217 downrated 4
wiki_linguistics 118.23 696 50% 1105 downrated 2
wiki_physical_science 71.04 1351 50% 1981 downrated 2
wiki_history 112.19 815 50% 1168 downrated 2
early_modern_science 47.27 1241 50% 2482 downrated 1
religious_translated 55.55 1071 50% 1757 downrated 2
cooking 15.21 2397 50% 4794 downrated 1
legal_scotus 244.18 332 50% 506 downrated 2
eu_parliament_debates 160.48 558 50% 760 downrated 2
openstax_science 91.22 1484 50% 1514 downrated 2
openstax_society 368.10 450 50% 350 4
wpa_life_histories 50.87 1790 50% 1590 3

Best form = the single best-ranked form in the corpus, share-blind — how the spelling itself ranked. Share = how much of that spelling belongs to this lemma, when several senses compete for it. Zipf rank = all the forms combined (variant spellings included), each scaled by its share, and what feeds the combined frequency rank. Combining forms improves on the best form, but a share below 100% pushes the other way and usually wins: a sense holding a small slice of a common spelling is a rare word, so its rank lands downrated below the best form — and once it falls past what the corpus can support it is capped at the rank an unlisted word would get.