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: 2431 (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 11.51 6758 100% 5375 2
20th_books 12.31 6228 100% 4944 2
wiki_math 29.63 2952 36% 2515 2
wiki_geography 27.59 1857 36% 5107 downrated 1
wiki_biology 21.75 2286 36% 6286 downrated 1
wiki_modern_life 51.85 985 36% 2709 downrated 1
wiki_arts 61.98 2247 36% 2197 2
wiki_society 111.18 1404 36% 1265 2
wiki_linguistics 26.40 1755 36% 4826 downrated 1
wiki_physical_science 153.01 351 36% 855 downrated 2
wiki_history 16.66 2970 36% 8168 downrated 1
early_modern_science 0.00 — — — 0
religious_translated 160.70 665 100% 665 1
cooking 138.16 898 36% 823 2
legal_scotus 55.82 1782 36% 2024 downrated 2
eu_parliament_debates 40.78 2456 36% 2156 2
openstax_science 73.40 812 36% 1876 downrated 2
openstax_society 58.91 1605 36% 2136 downrated 2
wpa_life_histories 5.82 4273 36% 11751 downrated 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.