Base Difficulty

Base difficulty: Level 22 edit

Level distribution for adverb (duration): 22: 2 225: 5 1120: 1 1399: 1

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: 984 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 241.01 108 17% 500 downrated 3
20th_books 223.85 116 17% 562 downrated 2
wiki_math 54.70 592 17% 2432 downrated 2
wiki_geography 113.78 231 17% 1018 downrated 3
wiki_biology 264.54 78 17% 381 downrated 3
wiki_modern_life 163.50 145 17% 607 downrated 3
wiki_arts 116.24 215 17% 949 downrated 3
wiki_society 70.78 401 17% 1687 downrated 2
wiki_linguistics 159.90 171 17% 772 downrated 3
wiki_physical_science 122.68 278 17% 1054 downrated 3
wiki_history 95.79 246 17% 1139 downrated 3
early_modern_science 199.49 109 17% 540 downrated 3
religious_translated 141.45 179 17% 876 downrated 2
cooking 134.62 267 17% 1111 downrated 2
legal_scotus 73.48 369 17% 1678 downrated 2
eu_parliament_debates 104.32 309 17% 1168 downrated 2
openstax_science 121.76 212 17% 948 downrated 2
openstax_society 117.91 234 17% 1034 downrated 2
wpa_life_histories 188.01 133 17% 696 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.