Base Difficulty

Base difficulty: Level 274 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: 4720 (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 16.09 1176 17% 5555 downrated 2
20th_books 16.44 1239 17% 5539 downrated 2
wiki_math 21.56 1023 17% 6138 downrated 1
wiki_geography 17.61 1302 17% 7812 downrated 1
wiki_biology 14.67 1600 17% 9000 capped 1
wiki_modern_life 40.93 631 17% 3177 downrated 2
wiki_arts 67.40 398 17% 1775 downrated 2
wiki_society 26.17 839 17% 5034 downrated 1
wiki_linguistics 19.53 1364 17% 6200 downrated 2
wiki_physical_science 18.37 1332 17% 7992 downrated 1
wiki_history 21.17 1032 17% 6192 downrated 1
early_modern_science 0.00 — — — 0
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 7.56 2545 17% 15270 downrated 1
eu_parliament_debates 39.10 524 17% 3144 downrated 1
openstax_science 43.22 591 17% 3141 downrated 2
openstax_society 39.89 576 17% 3456 downrated 1
wpa_life_histories 6.24 2840 17% 12552 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.