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: 815 (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 38.90 2631 100% 2032 2
20th_books 17.67 4207 100% 4207 1
wiki_math 35.80 2524 100% 2524 1
wiki_geography 608.71 254 100% 186 2
wiki_biology 114.01 1223 100% 1223 1
wiki_modern_life 380.22 326 100% 292 2
wiki_arts 197.89 646 100% 646 1
wiki_society 311.96 479 100% 389 2
wiki_linguistics 32.78 3274 100% 3274 1
wiki_physical_science 199.80 872 100% 704 2
wiki_history 110.34 1200 100% 1200 1
early_modern_science 43.28 2521 100% 2521 1
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 59.70 2033 100% 2033 1
eu_parliament_debates 442.81 310 100% 269 2
openstax_science 101.41 1799 100% 1272 2
openstax_society 356.73 589 100% 393 2
wpa_life_histories 76.41 1440 100% 1192 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.