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: 812 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cefr B2 (4 of 6) 6900

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 72.59 754 50% 1274 downrated 2
20th_books 49.22 1172 50% 1857 downrated 2
wiki_math 32.91 2330 50% 2659 downrated 2
wiki_geography 57.60 2007 50% 2409 downrated 2
wiki_biology 303.44 281 50% 387 downrated 2
wiki_modern_life 201.92 432 50% 616 downrated 2
wiki_arts 73.67 1724 50% 1879 downrated 2
wiki_society 188.79 474 50% 652 downrated 2
wiki_linguistics 59.12 1853 50% 2095 downrated 2
wiki_physical_science 345.14 321 50% 384 downrated 2
wiki_history 99.65 924 50% 1339 downrated 2
early_modern_science 284.00 292 50% 377 downrated 2
religious_translated 261.41 253 50% 435 downrated 2
cooking 51.83 1643 50% 1727 downrated 2
legal_scotus 231.43 315 50% 528 downrated 2
eu_parliament_debates 102.89 855 50% 1125 downrated 2
openstax_science 484.59 183 50% 228 downrated 2
openstax_society 229.83 439 50% 580 downrated 2
wpa_life_histories 91.42 628 50% 1133 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.