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: 2859 (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 32.24 2216 50% 2663 downrated 2
20th_books 35.76 2099 50% 2369 downrated 2
wiki_math 56.59 1576 50% 1869 downrated 2
wiki_geography 0.00 — — — 0
wiki_biology 30.85 3807 50% 3957 downrated 2
wiki_modern_life 38.97 3242 50% 3633 downrated 2
wiki_arts 99.94 1266 50% 1382 downrated 2
wiki_society 48.55 2341 50% 2850 downrated 2
wiki_linguistics 58.58 1744 50% 2101 downrated 2
wiki_physical_science 47.19 2656 50% 2852 downrated 2
wiki_history 54.48 1915 50% 2487 downrated 2
early_modern_science 47.84 2284 50% 2305 downrated 2
religious_translated 7.36 4990 50% 9980 downrated 1
cooking 0.00 — — — 0
legal_scotus 44.73 2530 50% 2573 downrated 2
eu_parliament_debates 69.38 1425 50% 1603 downrated 2
openstax_science 105.35 1142 50% 1327 downrated 2
openstax_society 52.70 2206 50% 2509 downrated 2
wpa_life_histories 16.47 4496 50% 4520 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.