Base Difficulty

Base difficulty: Level 1399 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: 1075 (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 35.42 3009 67% 2346 2
20th_books 21.45 3831 67% 3384 2
wiki_math 198.85 570 67% 653 downrated 2
wiki_geography 0.00 — — — 0
wiki_biology 0.00 — — — 0
wiki_modern_life 100.04 1793 67% 1479 2
wiki_arts 98.62 1591 67% 1405 2
wiki_society 276.43 600 67% 457 2
wiki_linguistics 105.35 1610 67% 1216 2
wiki_physical_science 235.37 492 67% 591 downrated 2
wiki_history 116.05 1549 67% 1167 2
early_modern_science 198.61 702 67% 567 2
religious_translated 133.94 910 67% 775 2
cooking 50.32 1844 67% 1598 2
legal_scotus 360.14 419 67% 348 2
eu_parliament_debates 439.72 291 67% 275 2
openstax_science 134.57 1201 67% 1039 2
openstax_society 140.15 1171 67% 1000 2
wpa_life_histories 11.90 5736 67% 4935 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.