Base Difficulty

Base difficulty: Level 1399 edit

Level distribution for verb (development): 30: 1 165: 2 170: 1 179: 1 196: 1 249: 1 278: 1 299: 2 300: 1 329: 1 470: 7 475: 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: 3179 (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 24.69 1029 17% 3627 downrated 3
20th_books 26.86 949 17% 3395 downrated 3
wiki_math 2.88 3934 17% 8000 capped 1
wiki_geography 40.50 1235 20% 3408 downrated 3
wiki_biology 16.98 2348 17% 7811 downrated 2
wiki_modern_life 40.30 1022 17% 3542 downrated 3
wiki_arts 46.80 822 17% 2868 downrated 3
wiki_society 109.58 293 17% 1087 downrated 4
wiki_linguistics 15.89 1962 17% 7289 downrated 2
wiki_physical_science 29.25 1626 17% 4674 downrated 3
wiki_history 44.48 1024 17% 3029 downrated 3
early_modern_science 28.13 888 17% 3955 downrated 2
religious_translated 10.58 2177 17% 8314 downrated 2
cooking 8.07 1793 17% 5200 capped 1
legal_scotus 19.34 1507 17% 5732 downrated 3
eu_parliament_debates 48.88 655 17% 2177 downrated 4
openstax_science 54.73 739 17% 2428 downrated 4
openstax_society 173.06 221 17% 728 downrated 4
wpa_life_histories 26.45 995 17% 3423 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.