Base Difficulty

Base difficulty: Level 225 edit

Level distribution for adverb (definite_frequency): 225: 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: 1390 (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 38.77 2269 100% 2269 1
20th_books 34.29 2441 100% 2441 1
wiki_math 97.01 1264 100% 1264 1
wiki_geography 79.05 1788 100% 1788 1
wiki_biology 198.44 669 100% 669 1
wiki_modern_life 162.52 838 100% 838 1
wiki_arts 195.58 656 100% 656 1
wiki_society 140.24 968 100% 968 1
wiki_linguistics 197.23 670 100% 670 1
wiki_physical_science 113.46 1290 100% 1290 1
wiki_history 118.45 1107 100% 1107 1
early_modern_science 141.62 796 100% 796 1
religious_translated 39.10 2386 100% 2386 1
cooking 183.67 703 100% 703 1
legal_scotus 37.04 2998 100% 2998 1
eu_parliament_debates 34.95 2628 100% 2628 1
openstax_science 66.50 2005 100% 2005 1
openstax_society 123.60 1155 100% 1155 1
wpa_life_histories 31.37 2734 100% 2734 1

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.