Base Difficulty

Base difficulty: Level 275 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: 1166 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cefr A1 (1 of 6) 800

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 27.89 1922 50% 3011 downrated 2
20th_books 30.18 1817 50% 2742 downrated 2
wiki_math 64.10 1309 50% 1732 downrated 2
wiki_geography 136.40 849 50% 992 downrated 2
wiki_biology 77.39 1288 50% 1785 downrated 2
wiki_modern_life 95.11 1068 50% 1517 downrated 2
wiki_arts 93.33 1087 50% 1463 downrated 2
wiki_society 63.84 1647 50% 2205 downrated 2
wiki_linguistics 25.80 3572 50% 3824 downrated 2
wiki_physical_science 74.42 1412 50% 1913 downrated 2
wiki_history 35.25 1955 50% 3910 downrated 1
early_modern_science 29.81 2707 50% 3404 downrated 2
religious_translated 25.26 1928 50% 3856 downrated 1
cooking 975.84 82 50% 159 downrated 2
legal_scotus 65.47 1494 50% 1896 downrated 2
eu_parliament_debates 61.94 1321 50% 1746 downrated 2
openstax_science 40.31 2938 50% 3042 downrated 2
openstax_society 45.68 1906 50% 2815 downrated 2
wpa_life_histories 35.18 1706 50% 2540 downrated 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.