Base Difficulty

Base difficulty: Level 105 edit

Level distribution for adverb (style): 6: 1 19: 4 20: 4 105: 46 1080: 1 1202: 1 1399: 2

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: 2742 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cambridge_yle Movers (2 of 3) 750
cefr A2 (2 of 6) 2100

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 79.67 825 25% 1141 downrated 3
20th_books 93.59 981 25% 989 downrated 3
wiki_math 6.05 3256 25% 8000 capped 1
wiki_geography 10.42 3274 25% 9000 capped 1
wiki_biology 0.00 — — — 0
wiki_modern_life 0.00 — — — 0
wiki_arts 0.00 — — — 0
wiki_society 0.00 — — — 0
wiki_linguistics 0.00 — — — 0
wiki_physical_science 0.00 — — — 0
wiki_history 0.00 — — — 0
early_modern_science 14.99 2645 25% 6815 downrated 2
religious_translated 17.55 1858 25% 5280 downrated 2
cooking 0.00 — — — 0
legal_scotus 9.61 3849 25% 9373 downrated 2
eu_parliament_debates 50.94 1794 25% 1796 downrated 3
openstax_science 0.00 — — — 0
openstax_society 19.72 2771 25% 6343 downrated 2
wpa_life_histories 75.95 1163 25% 1185 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.