Base Difficulty

Base difficulty: Level 475 edit

Level distribution for verb (existence): 3: 2 10: 1 23: 1 135: 1 170: 1 179: 1 214: 8 215: 1 220: 1 329: 1 415: 1 475: 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: 7227 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
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 3.94 3130 10% 18185 downrated 3
20th_books 3.37 3706 10% 19762 downrated 3
wiki_math 43.89 495 10% 2767 downrated 4
wiki_geography 32.47 1298 10% 4280 downrated 4
wiki_biology 25.08 1890 10% 5420 downrated 4
wiki_modern_life 22.46 1250 10% 6376 downrated 4
wiki_arts 14.24 1242 10% 9603 downrated 2
wiki_society 11.88 1652 10% 11000 capped 2
wiki_linguistics 8.17 1566 10% 9000 capped 1
wiki_physical_science 23.29 1463 10% 5921 downrated 4
wiki_history 12.36 1051 10% 9000 capped 1
early_modern_science 25.21 1420 10% 4538 downrated 4
religious_translated 3.52 4204 10% 10400 capped 2
cooking 0.00 — — — 0
legal_scotus 26.65 1287 10% 4679 downrated 4
eu_parliament_debates 21.01 1372 10% 5019 downrated 4
openstax_science 23.98 1664 10% 5497 downrated 4
openstax_society 17.90 1194 10% 7379 downrated 3
wpa_life_histories 4.24 3458 10% 17011 downrated 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.