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: 4337 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cambridge_yle Flyers (3 of 3) 1200
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 25.87 1007 20% 3560 downrated 2
20th_books 18.09 1532 20% 4921 downrated 2
wiki_math 4.62 3338 20% 8000 capped 1
wiki_geography 26.39 1575 20% 5321 downrated 2
wiki_biology 0.00 — — — 0
wiki_modern_life 14.00 2129 20% 10000 capped 1
wiki_arts 8.85 3099 20% 10000 capped 1
wiki_society 7.18 3823 20% 11000 capped 1
wiki_linguistics 4.62 4136 20% 9000 capped 1
wiki_physical_science 0.00 — — — 0
wiki_history 7.19 3673 20% 9000 capped 1
early_modern_science 26.96 1276 20% 4244 downrated 2
religious_translated 15.68 1884 20% 5984 downrated 2
cooking 296.13 188 20% 539 downrated 2
legal_scotus 3.20 7103 20% 19612 downrated 2
eu_parliament_debates 5.80 4173 20% 11000 capped 2
openstax_science 4.90 4404 20% 11000 capped 1
openstax_society 8.60 2940 20% 11000 capped 1
wpa_life_histories 20.03 1610 20% 4675 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.