Base Difficulty

Base difficulty: Level 1399 edit

Level distribution for noun (quantitative_concept): 20: 1 26: 1 162: 20 276: 22 380: 20 390: 1 456: 1 460: 1 1000: 1 1050: 2 1070: 2 1080: 5 1090: 1 1110: 1 1120: 1 1202: 2 1203: 1 1204: 2 1206: 1 1210: 2 1211: 1 1213: 7 1218: 1 1225: 2 1226: 1 1399: 21

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: 4109 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
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 14.17 1640 12% 4871 downrated 3
20th_books 5.65 2173 12% 13996 downrated 2
wiki_math 57.87 1148 12% 1779 downrated 2
wiki_geography 104.87 1134 12% 1344 downrated 2
wiki_biology 49.51 1113 12% 2611 downrated 2
wiki_modern_life 93.36 696 12% 1543 downrated 2
wiki_arts 14.48 1186 12% 9488 downrated 1
wiki_society 0.00 — — — 0
wiki_linguistics 6.87 2221 12% 9000 capped 1
wiki_physical_science 138.11 1157 12% 1008 3
wiki_history 7.35 2323 12% 9000 capped 1
early_modern_science 34.44 425 12% 3096 downrated 2
religious_translated 11.51 1361 12% 8432 downrated 2
cooking 0.00 — — — 0
legal_scotus 0.73 9147 12% 20000 capped 1
eu_parliament_debates 0.00 — — — 0
openstax_science 57.42 1524 12% 1923 downrated 3
openstax_society 9.29 1865 12% 11000 capped 1
wpa_life_histories 3.23 2968 12% 20000 capped 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.