Base Difficulty

Base difficulty: Level 221 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: 2757 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cambridge_yle Flyers (3 of 3) 1200
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 27.67 741 17% 3381 downrated 2
20th_books 20.93 986 17% 4536 downrated 2
wiki_math 16.17 1516 17% 6386 downrated 2
wiki_geography 15.75 2193 17% 8763 downrated 2
wiki_biology 12.27 1864 17% 9000 capped 1
wiki_modern_life 25.91 1237 17% 5602 downrated 2
wiki_arts 57.15 493 17% 2174 downrated 2
wiki_society 103.49 235 17% 1064 downrated 2
wiki_linguistics 31.89 852 17% 4027 downrated 2
wiki_physical_science 16.02 1528 17% 8000 capped 1
wiki_history 60.70 541 17% 2046 downrated 2
early_modern_science 74.48 333 17% 1477 downrated 2
religious_translated 23.65 915 17% 4258 downrated 2
cooking 0.00 — — — 0
legal_scotus 122.65 175 17% 869 downrated 2
eu_parliament_debates 117.86 218 17% 1064 downrated 2
openstax_science 27.78 979 17% 4921 downrated 2
openstax_society 74.27 422 17% 1785 downrated 2
wpa_life_histories 9.22 1925 17% 9430 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.