Base Difficulty

Base difficulty: Level 1399 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: 1707 (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 66.26 1196 14% 1272 downrated 4
20th_books 41.22 1870 14% 1832 4
wiki_math 71.73 2431 100% 1231 3
wiki_geography 0.00 — — — 0
wiki_biology 4.04 4226 14% 9000 capped 1
wiki_modern_life 33.07 3145 14% 4049 downrated 2
wiki_arts 33.90 2913 14% 3836 downrated 2
wiki_society 93.68 1210 14% 1451 downrated 4
wiki_linguistics 9.53 1913 14% 9000 capped 1
wiki_physical_science 4.46 3885 14% 8000 capped 1
wiki_history 8.92 2194 14% 9000 capped 1
early_modern_science 156.63 789 14% 729 4
religious_translated 70.89 680 14% 1395 downrated 3
cooking 5.47 2112 14% 5200 capped 1
legal_scotus 413.23 491 100% 309 4
eu_parliament_debates 293.64 233 14% 401 downrated 4
openstax_science 52.75 3776 100% 2091 2
openstax_society 35.22 2407 14% 3348 downrated 2
wpa_life_histories 14.25 3457 14% 4494 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.