Base Difficulty

Base difficulty: Level 270 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: 1153 (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 57.39 1498 80% 1510 downrated 2
20th_books 52.84 1586 80% 1620 downrated 2
wiki_math 384.35 327 80% 353 downrated 2
wiki_geography 27.87 3884 80% 4855 downrated 1
wiki_biology 90.35 1628 80% 1489 2
wiki_modern_life 124.35 1148 80% 1150 downrated 2
wiki_arts 100.43 1076 80% 1345 downrated 1
wiki_society 194.82 671 80% 665 2
wiki_linguistics 316.86 402 80% 404 downrated 2
wiki_physical_science 109.84 1067 80% 1334 downrated 1
wiki_history 49.73 2198 80% 2748 downrated 1
early_modern_science 268.51 407 80% 410 downrated 2
religious_translated 38.56 2006 80% 2508 downrated 1
cooking 57.69 1409 80% 1761 downrated 1
legal_scotus 213.23 762 80% 613 2
eu_parliament_debates 88.99 1233 80% 1212 2
openstax_science 117.03 1145 80% 1148 downrated 2
openstax_society 184.20 774 80% 757 2
wpa_life_histories 47.32 1871 80% 1841 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.