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: 1919 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cambridge_yle Flyers (3 of 3) 1200
cefr A1 (1 of 6) 800

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 254.54 182 20% 447 downrated 4
20th_books 303.84 162 20% 394 downrated 4
wiki_math 0.00 — — — 0
wiki_geography 0.00 — — — 0
wiki_biology 5.20 4476 20% 9000 capped 1
wiki_modern_life 21.73 2347 20% 6701 downrated 2
wiki_arts 52.65 1339 20% 2611 downrated 4
wiki_society 40.19 1663 17% 3509 downrated 3
wiki_linguistics 5.48 3665 20% 9000 capped 1
wiki_physical_science 0.00 — — — 0
wiki_history 46.50 836 20% 2818 downrated 3
early_modern_science 48.69 1182 20% 2325 downrated 4
religious_translated 45.14 1186 20% 2207 downrated 4
cooking 9.47 1829 20% 5200 capped 1
legal_scotus 10.36 3625 20% 9542 downrated 2
eu_parliament_debates 63.07 572 20% 1765 downrated 4
openstax_science 26.20 1665 20% 4811 downrated 3
openstax_society 84.93 667 20% 1633 downrated 4
wpa_life_histories 103.49 491 20% 1013 downrated 4

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.