Base Difficulty

Base difficulty: Level 214 edit

Level distribution for verb (perception): 5: 1 8: 2 185: 1 205: 1 214: 12 230: 1 265: 1 279: 1 455: 1 1040: 1 1399: 4

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: 1823 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cefr B2 (4 of 6) 6900

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 0.00 — — — 0
20th_books 3.47 8035 50% 16070 downrated 1
wiki_math 114.33 1022 50% 953 4
wiki_geography 50.04 1387 50% 2774 downrated 1
wiki_biology 130.97 657 50% 1021 downrated 2
wiki_modern_life 71.81 1914 50% 2067 downrated 2
wiki_arts 92.17 1148 50% 1467 downrated 3
wiki_society 188.52 635 50% 700 downrated 4
wiki_linguistics 120.92 1327 50% 1007 4
wiki_physical_science 122.37 801 50% 1178 downrated 2
wiki_history 70.64 1164 50% 1848 downrated 2
early_modern_science 0.00 — — — 0
religious_translated 14.61 4873 50% 5025 downrated 2
cooking 0.00 — — — 0
legal_scotus 151.69 1040 50% 826 4
eu_parliament_debates 57.90 2004 50% 1664 3
openstax_science 262.24 440 50% 510 downrated 3
openstax_society 159.97 1040 50% 851 4
wpa_life_histories 4.03 7623 50% 15246 downrated 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.