Base Difficulty

Base difficulty: Level 1399 edit

Level distribution for noun (collection_things): 278: 1 405: 1 450: 1 460: 9 1000: 5 1010: 1 1030: 1 1050: 3 1060: 1 1078: 2 1080: 1 1120: 1 1205: 3 1211: 1 1214: 1 1220: 3 1223: 2 1399: 33

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: 2594 (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 9.93 1974 14% 8599 downrated 2
20th_books 7.52 1902 14% 10777 downrated 2
wiki_math 11.65 1811 14% 8000 capped 2
wiki_geography 19.07 1959 17% 7329 downrated 2
wiki_biology 39.90 637 14% 3339 downrated 2
wiki_modern_life 169.56 174 17% 564 downrated 2
wiki_arts 66.59 480 14% 1851 downrated 2
wiki_society 44.92 579 14% 2882 downrated 2
wiki_linguistics 28.51 1179 14% 4533 downrated 2
wiki_physical_science 196.84 126 14% 527 downrated 2
wiki_history 31.69 887 14% 4198 downrated 2
early_modern_science 30.03 1175 14% 3890 downrated 2
religious_translated 12.35 1181 14% 8267 downrated 1
cooking 36.16 978 14% 3279 downrated 2
legal_scotus 37.15 823 14% 3524 downrated 2
eu_parliament_debates 20.91 1571 14% 5298 downrated 2
openstax_science 93.31 265 14% 1316 downrated 2
openstax_society 41.23 867 14% 3426 downrated 2
wpa_life_histories 12.35 1231 14% 7135 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.