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: 889 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 108.26 1066 100% 839 2
20th_books 76.14 1421 100% 1167 2
wiki_math 406.52 359 100% 328 2
wiki_geography 0.00 — — — 0
wiki_biology 29.95 4065 100% 4065 1
wiki_modern_life 50.24 2900 100% 2900 1
wiki_arts 55.17 2520 100% 2520 1
wiki_society 138.30 979 100% 979 1
wiki_linguistics 105.87 1508 100% 1128 2
wiki_physical_science 131.78 1106 100% 1106 1
wiki_history 75.85 1803 100% 1803 1
early_modern_science 201.99 726 100% 552 2
religious_translated 120.40 978 100% 821 2
cooking 0.00 — — — 0
legal_scotus 559.80 213 100% 196 2
eu_parliament_debates 570.30 237 100% 215 2
openstax_science 41.14 2988 100% 2988 1
openstax_society 84.74 1629 100% 1629 1
wpa_life_histories 42.57 2117 100% 2117 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.