Base Difficulty

Base difficulty: Level 17 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: 584 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cefr B1 (3 of 6) 4200

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 177.09 560 100% 560 1
20th_books 235.16 447 100% 447 1
wiki_math 70.45 1586 100% 1586 1
wiki_geography 98.11 1423 100% 1423 1
wiki_biology 317.87 378 100% 378 1
wiki_modern_life 237.66 513 100% 513 1
wiki_arts 157.26 832 100% 832 1
wiki_society 218.06 571 100% 571 1
wiki_linguistics 187.02 705 100% 705 1
wiki_physical_science 211.60 674 100% 674 1
wiki_history 271.46 417 100% 417 1
early_modern_science 370.57 288 100% 288 1
religious_translated 399.91 287 100% 287 1
cooking 27.04 2546 100% 2546 1
legal_scotus 118.40 1099 100% 1099 1
eu_parliament_debates 581.67 216 100% 216 1
openstax_science 285.10 457 100% 457 1
openstax_society 357.56 341 100% 341 1
wpa_life_histories 285.70 390 100% 390 1

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.