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: 3266 (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 1.20 6199 11% 20000 capped 1
20th_books 3.47 4357 11% 18988 downrated 2
wiki_math 92.83 165 11% 1354 downrated 2
wiki_geography 20.96 1510 11% 6673 downrated 2
wiki_biology 6.33 2408 11% 9000 capped 1
wiki_modern_life 88.34 212 11% 1225 downrated 2
wiki_arts 33.26 644 11% 3954 downrated 2
wiki_society 41.08 809 11% 3313 downrated 2
wiki_linguistics 142.74 98 11% 776 downrated 2
wiki_physical_science 53.73 363 11% 2504 downrated 2
wiki_history 20.25 1433 11% 6651 downrated 2
early_modern_science 4.68 2563 11% 10400 capped 1
religious_translated 1.66 4964 11% 10400 capped 1
cooking 3.13 2529 11% 5200 capped 1
legal_scotus 118.82 183 11% 934 downrated 2
eu_parliament_debates 69.50 414 20% 1766 downrated 2
openstax_science 41.49 546 11% 3286 downrated 2
openstax_society 33.16 1118 11% 4234 downrated 2
wpa_life_histories 3.30 4153 11% 20000 capped 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.