Base Difficulty

Base difficulty: Level 220 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: 1241 (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 244.34 125 20% 479 downrated 3
20th_books 199.02 150 20% 602 downrated 3
wiki_math 36.26 749 20% 3745 downrated 1
wiki_geography 132.65 291 20% 918 downrated 2
wiki_biology 92.73 544 20% 1411 downrated 2
wiki_modern_life 46.93 520 20% 2600 downrated 1
wiki_arts 93.50 360 20% 1250 downrated 2
wiki_society 94.19 566 20% 1328 downrated 3
wiki_linguistics 60.94 425 20% 2125 downrated 1
wiki_physical_science 35.94 808 20% 4040 downrated 1
wiki_history 241.08 190 20% 475 downrated 3
early_modern_science 119.30 207 20% 847 downrated 2
religious_translated 82.30 325 20% 1211 downrated 2
cooking 62.65 475 20% 2375 downrated 1
legal_scotus 32.42 1062 20% 3179 downrated 2
eu_parliament_debates 172.05 183 20% 678 downrated 2
openstax_science 57.10 836 20% 2201 downrated 2
openstax_society 117.48 500 20% 1056 downrated 3
wpa_life_histories 181.32 196 20% 565 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.