Base Difficulty

Base difficulty: Level 275 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: 1414 (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 32.26 3236 97% 2346 2
20th_books 11.23 5651 97% 5821 downrated 1
wiki_math 737.78 223 97% 177 2
wiki_geography 0.00 — — — 0
wiki_biology 0.00 — — — 0
wiki_modern_life 132.77 1603 97% 1098 2
wiki_arts 29.83 4270 97% 4398 downrated 1
wiki_society 70.05 3102 97% 1927 2
wiki_linguistics 96.53 2168 97% 1247 2
wiki_physical_science 112.34 1918 97% 1234 2
wiki_history 0.00 — — — 0
early_modern_science 89.21 2032 97% 1235 2
religious_translated 97.72 1332 97% 1005 2
cooking 0.00 — — — 0
legal_scotus 341.89 401 97% 357 2
eu_parliament_debates 48.17 3264 97% 1686 2
openstax_science 175.12 1184 97% 789 2
openstax_society 33.31 3514 97% 3619 downrated 1
wpa_life_histories 6.31 8848 97% 9113 downrated 1

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.