Base Difficulty

Base difficulty: Level 1399 edit

Level distribution for noun (path_infrastructure): 24: 1 26: 8 115: 2 135: 1 219: 3 255: 9 405: 2 1020: 2 1050: 1 1399: 10

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: 6422 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cefr B1 (3 of 6) 4200

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 5.56 1807 10% 15119 downrated 2
20th_books 3.79 2238 10% 20000 capped 1
wiki_math 48.95 447 10% 2778 downrated 2
wiki_geography 4.28 3179 10% 9000 capped 1
wiki_biology 9.96 1924 10% 9000 capped 2
wiki_modern_life 18.32 1143 10% 7941 downrated 2
wiki_arts 19.51 901 10% 6860 downrated 2
wiki_society 35.89 435 10% 3360 downrated 2
wiki_linguistics 25.20 899 10% 5187 downrated 2
wiki_physical_science 23.64 939 10% 6144 downrated 2
wiki_history 11.89 1104 10% 9000 capped 1
early_modern_science 13.24 1162 10% 8489 downrated 2
religious_translated 7.83 1718 10% 10400 capped 2
cooking 0.00 — — — 0
legal_scotus 28.65 472 10% 4251 downrated 2
eu_parliament_debates 46.75 276 10% 2512 downrated 2
openstax_science 26.66 709 10% 5207 downrated 2
openstax_society 38.62 424 10% 3386 downrated 2
wpa_life_histories 0.89 6506 10% 20000 capped 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.