Base Difficulty

Base difficulty: Level 1399 edit

Level distribution for verb (change): 22: 4 28: 1 109: 1 140: 1 162: 2 194: 1 254: 1 255: 1 309: 2 311: 1 321: 16 410: 2 415: 2 475: 5 1040: 1 1090: 1 1399: 38

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: 7213 (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% 18186 downrated 3
20th_books 3.37 3706 10% 19761 downrated 3
wiki_math 43.76 497 10% 2775 downrated 4
wiki_geography 32.09 1323 10% 4345 downrated 4
wiki_biology 24.85 1910 10% 5470 downrated 4
wiki_modern_life 22.36 1255 10% 6397 downrated 4
wiki_arts 14.11 1254 10% 9681 downrated 2
wiki_society 12.70 1507 10% 11000 capped 2
wiki_linguistics 8.11 1577 10% 9000 capped 1
wiki_physical_science 23.19 1469 10% 5945 downrated 4
wiki_history 12.10 1083 10% 9000 capped 1
early_modern_science 25.20 1420 10% 4539 downrated 4
religious_translated 3.52 4206 10% 10400 capped 2
cooking 0.00 — — — 0
legal_scotus 26.65 1287 10% 4680 downrated 4
eu_parliament_debates 21.01 1370 10% 5018 downrated 4
openstax_science 23.96 1665 10% 5495 downrated 4
openstax_society 17.88 1194 10% 7375 downrated 3
wpa_life_histories 4.90 3160 10% 13251 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.