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: 1287 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cefr A2 (2 of 6) 2100

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 18.36 4882 80% 3723 2
20th_books 11.95 6540 80% 4840 2
wiki_math 125.65 1210 80% 932 2
wiki_geography 70.21 1626 80% 2032 downrated 1
wiki_biology 295.57 539 80% 445 2
wiki_modern_life 176.56 703 80% 756 downrated 2
wiki_arts 259.01 454 80% 466 downrated 2
wiki_society 56.17 2001 80% 2501 downrated 1
wiki_linguistics 19.35 4014 80% 5018 downrated 1
wiki_physical_science 402.02 351 80% 334 2
wiki_history 46.95 2333 80% 2916 downrated 1
early_modern_science 77.46 1518 80% 1422 2
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 12.31 5358 80% 6697 downrated 1
eu_parliament_debates 51.00 1712 80% 2140 downrated 1
openstax_science 165.57 850 80% 839 2
openstax_society 74.74 1486 80% 1857 downrated 1
wpa_life_histories 19.00 4226 80% 3672 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.