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: 2081 (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 7.63 4052 31% 9266 downrated 2
20th_books 8.74 4216 31% 8041 downrated 2
wiki_math 19.90 2595 31% 4410 downrated 2
wiki_geography 69.22 939 31% 1984 downrated 2
wiki_biology 82.15 658 31% 1627 downrated 2
wiki_modern_life 81.38 810 31% 1711 downrated 2
wiki_arts 102.47 553 31% 1253 downrated 2
wiki_society 51.42 1679 31% 2757 downrated 2
wiki_linguistics 44.48 1544 31% 2864 downrated 2
wiki_physical_science 45.80 1312 31% 3081 downrated 2
wiki_history 115.69 578 31% 1083 downrated 2
early_modern_science 33.06 1822 31% 3405 downrated 2
religious_translated 5.12 4612 31% 10400 capped 1
cooking 0.00 — — — 0
legal_scotus 156.18 274 31% 755 downrated 2
eu_parliament_debates 19.88 2074 31% 4597 downrated 2
openstax_science 38.75 1981 31% 3427 downrated 2
openstax_society 41.85 1909 31% 3282 downrated 2
wpa_life_histories 32.96 1614 31% 2879 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.