Base Difficulty

Base difficulty: Level 275 edit

Level distribution for noun (concept_idea): 19: 2 26: 1 27: 1 221: 28 270: 30 274: 30 275: 28 280: 25 300: 1 360: 1 380: 2 1000: 1 1030: 1 1060: 5 1070: 6 1110: 4 1120: 4 1399: 66

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: 1184 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cefr B1 (3 of 6) 4200

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 15.96 4660 100% 4660 1
20th_books 20.40 4729 100% 3178 2
wiki_math 209.03 1183 100% 600 2
wiki_geography 101.56 2496 100% 1356 2
wiki_biology 294.42 894 100% 468 2
wiki_modern_life 248.40 1081 100% 585 2
wiki_arts 258.68 986 100% 523 2
wiki_society 125.39 2071 100% 1112 2
wiki_linguistics 359.53 676 100% 370 2
wiki_physical_science 265.57 1051 100% 552 2
wiki_history 62.52 4011 100% 2078 2
early_modern_science 0.00 — — — 0
religious_translated 19.16 4181 100% 4181 1
cooking 0.00 — — — 0
legal_scotus 58.08 2338 100% 1795 2
eu_parliament_debates 0.00 — — — 0
openstax_science 349.93 703 100% 406 2
openstax_society 257.11 981 100% 549 2
wpa_life_histories 20.62 3797 100% 3797 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.