Base Difficulty

Base difficulty: Level 450 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: 2397 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cefr B2 (4 of 6) 6900

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 18.97 1282 19% 4724 downrated 2
20th_books 13.47 1624 19% 6392 downrated 2
wiki_math 19.99 1204 19% 6261 downrated 1
wiki_geography 29.68 1100 19% 4563 downrated 2
wiki_biology 32.82 796 19% 4139 downrated 1
wiki_modern_life 51.11 439 19% 2283 downrated 1
wiki_arts 24.97 1046 19% 5439 downrated 1
wiki_society 29.45 871 19% 4529 downrated 1
wiki_linguistics 11.06 2173 19% 9000 capped 1
wiki_physical_science 390.56 50 19% 234 downrated 2
wiki_history 23.16 1084 19% 5637 downrated 1
early_modern_science 77.98 379 19% 1406 downrated 2
religious_translated 5.21 3198 19% 10400 capped 1
cooking 11.92 1558 19% 5200 capped 1
legal_scotus 4.48 4116 19% 20000 capped 1
eu_parliament_debates 10.44 1942 19% 10098 downrated 1
openstax_science 233.77 86 19% 406 downrated 2
openstax_society 21.70 1245 19% 6474 downrated 1
wpa_life_histories 4.96 3184 19% 16557 downrated 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.