Base Difficulty

Base difficulty: Level 321 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: 5255 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
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 4.92 2311 11% 16462 downrated 2
20th_books 5.96 1864 11% 13722 downrated 2
wiki_math 8.19 1987 11% 8000 capped 2
wiki_geography 14.65 1558 11% 9000 capped 2
wiki_biology 9.11 2552 11% 9000 capped 2
wiki_modern_life 57.96 284 11% 1931 downrated 2
wiki_arts 10.62 2060 11% 10000 capped 2
wiki_society 28.58 918 11% 4788 downrated 2
wiki_linguistics 2.25 4460 11% 9000 capped 1
wiki_physical_science 13.19 1780 11% 8000 capped 2
wiki_history 6.73 2269 11% 9000 capped 1
early_modern_science 3.84 3021 11% 10400 capped 1
religious_translated 0.00 — — — 0
cooking 9.76 1246 11% 5200 capped 1
legal_scotus 46.18 455 11% 2726 downrated 2
eu_parliament_debates 44.95 564 11% 2702 downrated 2
openstax_science 13.15 1691 11% 10005 downrated 2
openstax_society 111.19 193 11% 1019 downrated 2
wpa_life_histories 14.90 874 11% 6368 downrated 2

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.