Base Difficulty

Base difficulty: Level 1399 edit

Level distribution for verb (perception): 5: 1 8: 2 185: 1 205: 1 214: 12 230: 1 265: 1 279: 1 455: 1 1040: 1 1399: 4

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: 1023 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
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 48.35 4282 33% 1785 6
20th_books 31.06 5612 33% 2390 6
wiki_math 179.78 601 33% 747 downrated 4
wiki_geography 140.78 588 33% 934 downrated 4
wiki_biology 203.86 406 33% 635 downrated 4
wiki_modern_life 237.23 322 33% 507 downrated 4
wiki_arts 190.95 442 33% 658 downrated 4
wiki_society 307.25 327 33% 377 downrated 4
wiki_linguistics 314.93 419 33% 413 4
wiki_physical_science 208.25 445 33% 667 downrated 4
wiki_history 114.97 709 33% 1151 downrated 4
early_modern_science 58.34 1349 33% 1920 downrated 3
religious_translated 77.30 2133 33% 1113 5
cooking 0.00 — — — 0
legal_scotus 136.07 1378 33% 797 7
eu_parliament_debates 168.43 991 33% 574 7
openstax_science 145.88 643 33% 962 downrated 3
openstax_society 136.82 890 33% 1033 downrated 3
wpa_life_histories 13.44 3896 33% 4975 downrated 4

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.