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: 1192 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
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 13.92 4357 80% 5446 downrated 1
20th_books 13.63 4314 80% 5392 downrated 1
wiki_math 260.54 452 80% 496 downrated 2
wiki_geography 179.46 792 80% 745 2
wiki_biology 223.99 564 80% 581 downrated 2
wiki_modern_life 140.32 1187 80% 1037 2
wiki_arts 177.34 1049 80% 773 2
wiki_society 202.32 851 80% 671 2
wiki_linguistics 363.30 357 80% 352 2
wiki_physical_science 194.38 691 80% 722 downrated 2
wiki_history 132.67 1151 80% 999 2
early_modern_science 145.19 601 80% 751 downrated 1
religious_translated 56.99 1448 80% 1810 downrated 1
cooking 21.64 2580 80% 3225 downrated 1
legal_scotus 35.94 3108 80% 2692 2
eu_parliament_debates 61.96 1479 80% 1849 downrated 1
openstax_science 101.41 1385 80% 1291 2
openstax_society 95.57 1934 80% 1407 2
wpa_life_histories 38.00 1962 80% 2452 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.