Base Difficulty

Base difficulty: Level 22 edit

Level distribution for verb (change): 22: 4 28: 1 109: 1 140: 1 162: 2 194: 1 254: 1 255: 1 309: 2 311: 1 321: 16 410: 2 415: 2 475: 5 1040: 1 1090: 1 1399: 38

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: 715 (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 Flyers (3 of 3) 1200
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 171.87 257 20% 568 downrated 4
20th_books 168.06 261 20% 598 downrated 4
wiki_math 64.90 671 20% 1582 downrated 3
wiki_geography 277.73 208 20% 445 downrated 4
wiki_biology 83.92 348 20% 1450 downrated 2
wiki_modern_life 219.41 162 20% 512 downrated 4
wiki_arts 287.82 178 20% 419 downrated 4
wiki_society 181.09 282 20% 682 downrated 4
wiki_linguistics 464.98 245 20% 268 downrated 4
wiki_physical_science 80.32 398 20% 1675 downrated 2
wiki_history 422.01 161 20% 270 downrated 4
early_modern_science 131.45 218 20% 771 downrated 3
religious_translated 164.96 221 20% 693 downrated 3
cooking 75.72 554 20% 1740 downrated 2
legal_scotus 67.39 766 20% 1509 downrated 4
eu_parliament_debates 177.04 228 20% 571 downrated 5
openstax_science 139.81 236 20% 804 downrated 3
openstax_society 250.50 226 20% 500 downrated 4
wpa_life_histories 339.61 110 20% 368 downrated 4

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.