Base Difficulty

Base difficulty: Level 320 edit

Level distribution for adjective (quality): 3: 1 11: 10 14: 12 17: 23 18: 3 20: 4 318: 35 320: 28 330: 1 340: 2 360: 2 380: 1 400: 3 420: 4 430: 27 469: 27 470: 2 1040: 2 1060: 2 1070: 13 1090: 3 1110: 2 1120: 47 1214: 1 1399: 16

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: 3995 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cambridge_yle Flyers (3 of 3) 1200
cefr B2 (4 of 6) 6900

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 55.61 468 20% 1758 downrated 3
20th_books 50.90 511 20% 1950 downrated 3
wiki_math 8.75 2216 20% 8000 capped 1
wiki_geography 36.86 957 20% 3686 downrated 2
wiki_biology 50.50 659 20% 2644 downrated 2
wiki_modern_life 24.24 1197 20% 5985 downrated 1
wiki_arts 16.56 1661 20% 8305 downrated 1
wiki_society 9.53 2932 20% 11000 capped 1
wiki_linguistics 6.30 3348 20% 9000 capped 1
wiki_physical_science 41.58 905 20% 3430 downrated 2
wiki_history 13.89 1989 20% 9000 capped 1
early_modern_science 45.09 635 20% 2368 downrated 3
religious_translated 50.90 486 20% 2063 downrated 2
cooking 68.94 444 20% 2220 downrated 1
legal_scotus 2.35 6274 20% 20000 capped 1
eu_parliament_debates 6.84 2673 20% 11000 capped 1
openstax_science 38.21 1058 20% 3608 downrated 2
openstax_society 24.61 1522 20% 5370 downrated 2
wpa_life_histories 27.04 819 20% 3529 downrated 2

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.