Base Difficulty

Base difficulty: Level 1399 edit

Level distribution for verb (aspectual): 1399: 3

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: 2240 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cambridge_yle Starters (1 of 3) 325
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 26.60 1228 25% 3340 downrated 2
20th_books 22.82 1333 25% 3899 downrated 2
wiki_math 115.26 354 25% 1100 downrated 3
wiki_geography 88.57 611 33% 1460 downrated 2
wiki_biology 39.13 869 25% 3476 downrated 1
wiki_modern_life 77.46 904 25% 1836 downrated 2
wiki_arts 133.24 514 25% 925 downrated 2
wiki_society 52.74 1018 25% 2596 downrated 2
wiki_linguistics 56.15 868 25% 2290 downrated 2
wiki_physical_science 47.68 970 25% 2927 downrated 2
wiki_history 100.49 733 33% 1288 downrated 2
early_modern_science 52.53 703 25% 2105 downrated 2
religious_translated 45.46 824 25% 2247 downrated 2
cooking 12.96 1731 25% 5200 capped 1
legal_scotus 46.48 1149 25% 2531 downrated 3
eu_parliament_debates 47.56 1079 25% 2214 downrated 3
openstax_science 57.45 827 25% 2396 downrated 2
openstax_society 45.81 1374 25% 2799 downrated 3
wpa_life_histories 26.69 1880 25% 3115 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.